using System;

class ObrniString2 {
  static void Main() {
    Console.Write("Unesi string: ");
    string s = Console.ReadLine();
    Console.WriteLine(Obrni(s));
  }

  static string Obrni(string s) {
    char[] t = s.ToCharArray();
    int n = t.Length;
    for(int i = 0; i < n/2; i++) {
      char c = t[i];
      t[i] = t[n - 1 - i];
      t[n - 1 - i] = c;
    }
    return new string(t);
  }
}