#include <bits/stdc++.h>
using namespace std;
char s[1005];
int main() {
  int n, f = 1;
  char *p, *q;
  scanf("%s", s);
  n = strlen(s);
  p = s;
  q = s + n - 1;
  while (p <= q) {
    if (*p == *q) {
      p++;
      q--;
    } else {
      f = 0;
      break;
    }
  }
  printf("%s", s);
  if (!f) {
    for (int i = n - 1; i >= 0; i--) printf("%c", s[i]);
  }
  return 0;
}
