1 #include <iostream> 2 #include <stdlib.h> 3 #include <string> 4 #include <vector> 5 #include <algorithm> 6 #include <string.h> 7 #include <stack> 8 #include <unordered_map> 9 #include <math.h> 10 using namespace std; 11 12 int main() 13 { 14 char c; 15 int flag = 1; 16 while(~(c = getchar())) 17 { 18 if(c=='"') 19 { 20 cout << (flag ? "``" : "''"); 21 flag = !flag; 22 } 23 else 24 cout << c; 25 } 26 return 0; 27 }