#include <bits/stdc++.h>
using namespace std;
inline int read() {
  int x = 0, f = 1;
  char ch = getchar();
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    x = x * 10 + ch - '0';
    ch = getchar();
  }
  return x * f;
}
char ch[100010];
int main() {
  scanf("%s", ch);
  int n = strlen(ch);
  for (int i = 0; i <= n - 1; i++) cout << ch[i];
  for (int i = n - 2; i >= 0; i--) cout << ch[i];
  return 0;
}
