ICM Technex 2018 and Codeforces Round #463 (Div. 1 + Div. 2, combined) A

2018-02-19

A. Palindromic Supersequence

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

You are given a string A. Find a string B, where B is a palindrome and A is a subsequence of B.

A subsequence of a string is a string that can be derived from it by deleting some (not necessarily consecutive) characters without changing the order of the remaining characters. For example, "cotst" is a subsequence of "contest".

A palindrome is a string that reads the same forward or backward.

The length of string B should be at most 10⁴. It is guaranteed that there always exists such string.

You do not need to find the shortest answer, the only restriction is that the length of string B should not exceed 10⁴.

Input

First line contains a string A (1 ≤ |A| ≤ 10³) consisting of lowercase Latin letters, where |A| is a length of A.

Output

Output single line containing B consisting of only lowercase Latin letters. You do not need to find the shortest answer, the only restriction is that the length of string B should not exceed 10⁴. If there are many possible B, print any of them.

Examples

input

aba

output

aba

input

ab

output

aabaa

Note

In the first example, "aba" is a subsequence of "aba" which is a palindrome.

In the second example, "ab" is a subsequence of "aabaa" which is a palindrome.

感想：大水题 但是 1e3*2=2e3<1e4  一直以为大于后者 导致写了很久 算了 就算学了STL

code1

#include<string.h>
#include<cmath>
#include<cstdio>
#include<algorithm>
#include<iostream>
#include<vector> 
#include<queue>
using namespace std;
#define MAX 0x3f3f3f3f
#define fi first
#define se second
#define Len 1e8+5
int main()
{
    string s,a;       //字符串用string 不是char
    cin>>s;
    cout<<s;
    a.assign(s.rbegin(),s.rend());
    cout<<a<<endl;    //换行不换行是有区别的     
        
}

code2

#include<string.h>
#include<cmath>
#include<cstdio>
#include<algorithm>
#include<iostream>
#include<vector> 
#include<queue>
using namespace std;
#define MAX 0x3f3f3f3f
#define fi first
#define se second
#define Len 1e8+5
int main()
{
    string s;
    cin>>s;
    cout<<s;
    reverse(s.begin(),s.end()); //
    cout<<s<<endl; 
}