easy~

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    while (n % 10 == 0) {
        n /= 10;
    }
    long long ans = 0;
    while (n) {
        ans = ans * 10 + n % 10;
        n /= 10;
    }
    cout << ans << endl;
    return 0;
}