import java.lang.String;

public class ReverseStrings {

  static String inputString;

  public static void main(String[] args) {

    try {
    
      inputString = args[0];
    }
    
    catch (Exception e) {

      System.out.println("\nNo input String.\nUsage: strings <input string>");
      System.exit(0);
    }
    
    reverse();
  }
  
  public static void reverse() {

    int index = inputString.length() - 1;
    
    String rev_string = "";

    while(index >= 0) {
      
      rev_string += inputString.charAt(index);
      index--;
    }
    
    System.out.println(rev_string);
  }
}