#include <iostream>
using namespace std;

int main() {
    int num;
    char tmp;
    cin >> num;
    if (num == 0)
        cout << '0';
    while(num){
        tmp = num%10 + '0';
        cout << tmp;
        num/=10;
    }
    return 0;
}
// 64 位输出请用 printf("%lld")