C++ :

#include <iostream>
#include <string>
using namespace std;
int main() {
    string str, reversedStr;
    cin >> str;
    int len = str.length();
    for (int i = len - 1; i >= 0; i--) {
        reversedStr += str[i];
    }
    cout << reversedStr;
    return 0;
}