import java.util.Scanner;
public class java{
    public static void main(String [] args){
        Scanner sa=new Scanner (System.in);
      String ch,ch1;
      int l;
      ch1="";
      System.out.println("donner la chaine : \n");
      ch=sa.nextLine();
      l=ch.length();
      l=l-1;
      do{
          ch1=ch1+ch.charAt(l);
          l=l-1;
      }while(l>=0);
      System.out.println(ch1);
      
      } 
    }