#include <bits/stdc++.h>
#include <atcoder/all>
 
#define elif else if
#define ll long long
#define vll vector<long long>
#define vec vector
#define embk emplace_back
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep3(i, n, k) for (int i = k; i < (int)(n); i++)
#define all(a) a.begin(), a.end()
 
using namespace std;
using namespace atcoder;
const ll INF = 1LL << 60;
const ll mod = 998244353;

int main() {
  string s; cin >> s;
  string t = s;
  reverse(all(t));
  
  rep(i, s.size()) {
    string u = s + t.substr(t.size()-i);
    bool flag = 1;
    rep(j, u.size()/2+1) {
      if (u[j] != u[u.size()-j-1]) flag = 0;
    }
    if (flag) {
      cout << u << endl;
      return 0;
    }
  }
  
}