#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull) rng() % B;
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string s; cin >> s;
    auto res = s+s;
    int n = s.size();
    for (int i = n-1; i >= 0; --i) {
        int l = i, r = n-1-i;
        if(l < r) break;
        bool ok = true;
        for (int j = 1; j+i < n; ++j) {
            if(s[i+j] != s[i-j]) {
                ok = false; break;
            }
        }
        if(ok) {
            res = s;
            for (int j = 1; i-j >= 0; ++j) {
                if(i+j < n) continue;
                res += s[i-j];
            }
        }
    }
    cout << res << endl;
}