#include <iostream>
#include<vector>
using namespace std;

int main() {
    string data;
    cin>>data;
    vector<char> result;
    for (int k = 0; k<data.size(); k++) {
        result.push_back(data[k]);
    }
    for (int k = result.size()-1; k>=0; k--) {
        cout<<result[k];
    }
    cout<<endl;
}
// 64 位输出请用 printf("%lld")