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

int main()
{
    int k;
    string s;
    cout << "enter string: ";
    cin >> s;
    cout << s << " reversed is ";
    
    k = s.length() - 1;   // index of last character in s
    while (k >= 0)
    {   cout << s.substr(k,1);
        k -= 1;
    }
    return 0;
}