reverse是个好东西！！！

#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string a;
    cin >> a;
    reverse(a.begin(), a.end());
    cout << a;
    return 0;
}