#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<iostream>
#include<vector>
#include<cmath>
#include<algorithm>
#include<memory.h>
#include<map>
#include<set>
#include<queue>
#include<list>
#include<sstream>
#include<cstring>
#include<numeric>
using namespace std;

const int N = 1e5 + 1;

char s[N];

bool isPalindrome(int l, int r) {
    for (; l < r; l++, r--)
        if (s[l] != s[r])
            return false;
    return true;
}
int main() {
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    gets_s(s);
    int len = strlen(s);
    reverse(s, s + len);
    int id = 0;
    for (int i = 1; i < len - 1; i++) {
        if (s[i] == s[0]) {
            if (isPalindrome(0, i)) {
                id = i;
            }
        }
    }
    if (id == len - 1) {
        printf("%s%s", s, s);
        return 0;
    }
    string bad = string(s + id + 1, s + len);
    reverse(s, s + len);
    printf("%s%s", s, bad.c_str());
    return 0;
}