#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string s;
    cin >> s;
    int n = s.size();
    for (int i = 0; i <= n; i++) {
        string cur = s;
        for (int j = 0; j < i; j++) {
            cur += '.';
        }
        bool ok = true;
        for (int j = 0; j < (int) cur.size(); j++) {
            if (cur[j] == '.' || cur[(int) cur.size() - 1 - j] == '.') {
                continue;
            }
            if (cur[j] != cur[(int) cur.size() - 1 - j]) {
                ok = false;
                break;
            }
        }
        if (ok) {
            for (int j = 0; j < (int) cur.size(); j++) {
                if (cur[j] == '.') {
                    cur[j] = cur[(int) cur.size() - 1 - j];
                }
            }
            cout << cur << '\n';
            return 0;
        }
    }
}