/* -*- coding: utf-8 -*-
 *
 * 2234.cc:  No.2234 palindromer - yukicoder
 */

#include<cstdio>
#include<cstring>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 100;

/* typedef */

/* global variables */

char s[MAX_N + 4];

/* subroutines */

inline bool palindrome(int n, char t[]) {
  for (int i = 0, j = n - 1; i < j; i++, j--)
    if (t[i] != t[j]) return false;
  return true;
}

/* main */

int main() {
  scanf("%s", s);
  int n = strlen(s);

  int k = 0;
  for (; k < n; k++)
    if (palindrome(n - k, s + k)) break;

  for (int i = 0; i < n; i++) putchar(s[i]);
  for (int i = k - 1; i >= 0; i--) putchar(s[i]);
  putchar('\n');
  
  return 0;
}