1 /*只能打表了*/
2 #include<iostream>
3 //#include<fstream>
4 //#include<sstream>
5 //#include<ctime>
6 //#include<cmath>
7 using namespace std;
8 //ofstream fout("C:\\Users\\桑海\\Desktop\\Temporary\\out2.txt");
9
10 const int maxn = 780 + 5;
11 int p[maxn] = {
12 5, 7, 11, 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757,
13 787, 797, 919, 929, 10301, 10501, 10601, 11311, 11411, 12421,
14 12721, 12821, 13331, 13831, 13931, 14341, 14741, 15451, 15551,
15 16061, 16361, 16561, 16661, 17471, 17971, 18181, 18481, 19391,
16 19891, 19991, 30103, 30203, 30403, 30703, 30803, 31013, 31513,
17 32323, 32423, 33533, 34543, 34843, 35053, 35153, 35353, 35753,
18 36263, 36563, 37273, 37573, 38083, 38183, 38783, 39293, 70207,
19 70507, 70607, 71317, 71917, 72227, 72727, 73037, 73237, 73637,
20 74047, 74747, 75557, 76367, 76667, 77377, 77477, 77977, 78487,
21 78787, 78887, 79397, 79697, 79997, 90709, 91019, 93139, 93239,
22 93739, 94049, 94349, 94649, 94849, 94949, 95959, 96269, 96469,
23 96769, 97379, 97579, 97879, 98389, 98689, 1003001, 1008001, 1022201,
24 1028201, 1035301, 1043401, 1055501, 1062601, 1065601, 1074701, 1082801,
25 1085801, 1092901, 1093901, 1114111, 1117111, 1120211, 1123211, 1126211,
26 1129211, 1134311, 1145411, 1150511, 1153511, 1160611, 1163611, 1175711,
27 1177711, 1178711, 1180811, 1183811, 1186811, 1190911, 1193911, 1196911,
28 1201021, 1208021, 1212121, 1215121, 1218121, 1221221, 1235321, 1242421,
29 1243421, 1245421, 1250521, 1253521, 1257521, 1262621, 1268621, 1273721,
30 1276721, 1278721, 1280821, 1281821, 1286821, 1287821, 1300031, 1303031,
31 1311131, 1317131, 1327231, 1328231, 1333331, 1335331, 1338331, 1343431,
32 1360631, 1362631, 1363631, 1371731, 1374731, 1390931, 1407041, 1409041,
33 1411141, 1412141, 1422241, 1437341, 1444441, 1447441, 1452541, 1456541,
34 1461641, 1463641, 1464641, 1469641, 1486841, 1489841, 1490941, 1496941,
35 1508051, 1513151, 1520251, 1532351, 1535351, 1542451, 1548451, 1550551,
36 1551551, 1556551, 1557551, 1565651, 1572751, 1579751, 1580851, 1583851,
37 1589851, 1594951, 1597951, 1598951, 1600061, 1609061, 1611161, 1616161,
38 1628261, 1630361, 1633361, 1640461, 1643461, 1646461, 1654561, 1657561,
39 1658561, 1660661, 1670761, 1684861, 1685861, 1688861, 1695961, 1703071,
40 1707071, 1712171, 1714171, 1730371, 1734371, 1737371, 1748471, 1755571,
41 1761671, 1764671, 1777771, 1793971, 1802081, 1805081, 1820281, 1823281,
42 1824281, 1826281, 1829281, 1831381, 1832381, 1842481, 1851581, 1853581,
43 1856581, 1865681, 1876781, 1878781, 1879781, 1880881, 1881881, 1883881,
44 1884881, 1895981, 1903091, 1908091, 1909091, 1917191, 1924291, 1930391,
45 1936391, 1941491, 1951591, 1952591, 1957591, 1958591, 1963691, 1968691,
46 1969691, 1970791, 1976791, 1981891, 1982891, 1984891, 1987891, 1988891,
47 1993991, 1995991, 1998991, 3001003, 3002003, 3007003, 3016103, 3026203,
48 3064603, 3065603, 3072703, 3073703, 3075703, 3083803, 3089803, 3091903,
49 3095903, 3103013, 3106013, 3127213, 3135313, 3140413, 3155513, 3158513,
50 3160613, 3166613, 3181813, 3187813, 3193913, 3196913, 3198913, 3211123,
51 3212123, 3218123, 3222223, 3223223, 3228223, 3233323, 3236323, 3241423,
52 3245423, 3252523, 3256523, 3258523, 3260623, 3267623, 3272723, 3283823,
53 3285823, 3286823, 3288823, 3291923, 3293923, 3304033, 3305033, 3307033,
54 3310133, 3315133, 3319133, 3321233, 3329233, 3331333, 3337333, 3343433,
55 3353533, 3362633, 3364633, 3365633, 3368633, 3380833, 3391933, 3392933,
56 3400043, 3411143, 3417143, 3424243, 3425243, 3427243, 3439343, 3441443,
57 3443443, 3444443, 3447443, 3449443, 3452543, 3460643, 3466643, 3470743,
58 3479743, 3485843, 3487843, 3503053, 3515153, 3517153, 3528253, 3541453,
59 3553553, 3558553, 3563653, 3569653, 3586853, 3589853, 3590953, 3591953,
60 3594953, 3601063, 3607063, 3618163, 3621263, 3627263, 3635363, 3643463,
61 3646463, 3670763, 3673763, 3680863, 3689863, 3698963, 3708073, 3709073,
62 3716173, 3717173, 3721273, 3722273, 3728273, 3732373, 3743473, 3746473,
63 3762673, 3763673, 3765673, 3768673, 3769673, 3773773, 3774773, 3781873,
64 3784873, 3792973, 3793973, 3799973, 3804083, 3806083, 3812183, 3814183,
65 3826283, 3829283, 3836383, 3842483, 3853583, 3858583, 3863683, 3864683,
66 3867683, 3869683, 3871783, 3878783, 3893983, 3899983, 3913193, 3916193,
67 3918193, 3924293, 3927293, 3931393, 3938393, 3942493, 3946493, 3948493,
68 3964693, 3970793, 3983893, 3991993, 3994993, 3997993, 3998993, 7014107,
69 7035307, 7036307, 7041407, 7046407, 7057507, 7065607, 7069607, 7073707,
70 7079707, 7082807, 7084807, 7087807, 7093907, 7096907, 7100017, 7114117,
71 7115117, 7118117, 7129217, 7134317, 7136317, 7141417, 7145417, 7155517,
72 7156517, 7158517, 7159517, 7177717, 7190917, 7194917, 7215127, 7226227,
73 7246427, 7249427, 7250527, 7256527, 7257527, 7261627, 7267627, 7276727,
74 7278727, 7291927, 7300037, 7302037, 7310137, 7314137, 7324237, 7327237,
75 7347437, 7352537, 7354537, 7362637, 7365637, 7381837, 7388837, 7392937,
76 7401047, 7403047, 7409047, 7415147, 7434347, 7436347, 7439347, 7452547,
77 7461647, 7466647, 7472747, 7475747, 7485847, 7486847, 7489847, 7493947,
78 7507057, 7508057, 7518157, 7519157, 7521257, 7527257, 7540457, 7562657,
79 7564657, 7576757, 7586857, 7592957, 7594957, 7600067, 7611167, 7619167,
80 7622267, 7630367, 7632367, 7644467, 7654567, 7662667, 7665667, 7666667,
81 7668667, 7669667, 7674767, 7681867, 7690967, 7693967, 7696967, 7715177,
82 7718177, 7722277, 7729277, 7733377, 7742477, 7747477, 7750577, 7758577,
83 7764677, 7772777, 7774777, 7778777, 7782877, 7783877, 7791977, 7794977,
84 7807087, 7819187, 7820287, 7821287, 7831387, 7832387, 7838387, 7843487,
85 7850587, 7856587, 7865687, 7867687, 7868687, 7873787, 7884887, 7891987,
86 7897987, 7913197, 7916197, 7930397, 7933397, 7935397, 7938397, 7941497,
87 7943497, 7949497, 7957597, 7958597, 7960697, 7977797, 7984897, 7985897,
88 7987897, 7996997, 9002009, 9015109, 9024209, 9037309, 9042409, 9043409,
89 9045409, 9046409, 9049409, 9067609, 9073709, 9076709, 9078709, 9091909,
90 9095909, 9103019, 9109019, 9110119, 9127219, 9128219, 9136319, 9149419,
91 9169619, 9173719, 9174719, 9179719, 9185819, 9196919, 9199919, 9200029,
92 9209029, 9212129, 9217129, 9222229, 9223229, 9230329, 9231329, 9255529,
93 9269629, 9271729, 9277729, 9280829, 9286829, 9289829, 9318139, 9320239,
94 9324239, 9329239, 9332339, 9338339, 9351539, 9357539, 9375739, 9384839,
95 9397939, 9400049, 9414149, 9419149, 9433349, 9439349, 9440449, 9446449,
96 9451549, 9470749, 9477749, 9492949, 9493949, 9495949, 9504059, 9514159,
97 9526259, 9529259, 9547459, 9556559, 9558559, 9561659, 9577759, 9583859,
98 9585859, 9586859, 9601069, 9602069, 9604069, 9610169, 9620269, 9624269,
99 9626269, 9632369, 9634369, 9645469, 9650569, 9657569, 9670769, 9686869,
100 9700079, 9709079, 9711179, 9714179, 9724279, 9727279, 9732379, 9733379,
101 9743479, 9749479, 9752579, 9754579, 9758579, 9762679, 9770779, 9776779,
102 9779779, 9781879, 9782879, 9787879, 9788879, 9795979, 9801089, 9807089,
103 9809089, 9817189, 9818189, 9820289, 9822289, 9836389, 9837389, 9845489,
104 9852589, 9871789, 9888889, 9889889, 9896989, 9902099, 9907099, 9908099,
105 9916199, 9918199, 9919199, 9921299, 9923299, 9926299, 9927299, 9931399,
106 9932399, 9935399,9938399, 9957599, 9965699, 9978799, 9980899, 9981899, 9989899};
107 /*
108 bool is_primer(int x)
109 {
110 if(x == 1)
111 return false;
112 int end = floor(sqrt(x) + 0.5);
113 for(int i = 2; i <= end; ++i)
114 if(x % i == 0)
115 return false;
116 return true;
117 }
118 bool is_palindromic(int x)
119 {
120 stringstream ss;
121 string s;
122 ss << x;
123 ss >> s;
124 int len = s.size();
125 for(int i = 0; i <= len/2; ++i)
126 if(s[i] != s[len-i-1])
127 return false;
128 return true;
129 }
130 */
131 int main()
132 {
133 int a, b;
134 while(cin >> a >> b)
135 {
136 /*
137 int count = 0;
138 for(int i = a; i <= b; ++i)
139 if(is_palindromic(i) && is_primer(i))
140 {
141 ++count;
142 fout << i << ", ";
143 cout << i << endl;
144 }
145 cout << count << endl;
146 cout << (double)clock()/CLOCKS_PER_SEC;
147 */
148 for(int i = 0; i < maxn; ++i)
149 {
150 if(p[i] >= a && p[i] <= b)
151 cout << p[i] << endl;
152 }
153 cout << endl;
154 }
155 return 0;
156 }
1413
