#include <bits/stdc++.h>
using namespace std;
int n;
int main() {
    cin >> n;
    int cnt = 0;
    if (n == 0) {
        cout << 0;
        return 0;
    }
    while (n != 0) {
        cnt = cnt * 10 + n % 10;
        n /= 10;
    }
    cout << cnt;
    return 0;
}