#include <stdio.h>

int main () {
  char a[101] = "";
  
  int res = 0;
  
  char ans[200] = "";
  
  int len = 0;
  int is_ok = 0;
  
  res = scanf("%s", a);
  while (a[len] != '\0') {
    ans[len] = a[len];
    len++;
  }
  
  for (int i = 0; i < len; i++) {
    if (is_ok <= 0) {
      for (int j = 0; j < i; j++) {
        ans[len+i-j-1] = ans[j];
      }
      ans[len+i] = '\0';
      is_ok = 1;
      for (int j = 0; j < len+i; j++) {
        if (ans[j] != ans[len+i-j-1]) {
          is_ok = 0;
        }
      }
    }
  }
  
  printf("%s\n", ans);
  return 0;
}