#include <bits/stdc++.h>

using namespace std;

int main() {
    string S;
    cin >> S;
    int n = S.length();
    assert(2 <= n && n <= 2000000);
    for (int i = 0; i < n; ++i) {
        assert('A' <= S[i] && S[i] <= 'Z');
    }
    for (int i = 0; i < n; i++)
    {
        cout << S[0];
    }
    cout << endl;
}