/* Problem Description
Write a recursive function that takes a string, S, as input and prints the characters of S in reverse order.
        Problem Constraints
                                1 <= |s| <= 1000    */

import java.util.*;

public class Main {
    
    // Function to reverse and print a string using recursion
    public static void reverseAndPrint(String S) {
        // BASE CONDITION: If the string is empty, return
        if (S.length() == 0) {
            return;
        }

        // Recursive call with the substring starting from the second character
        reverseAndPrint(S.substring(1));

        // Print the first character
        System.out.print(S.charAt(0));
    }
    public static void main(String[] args) {
        // Input from the user
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();

        // Call the function to reverse and print the string
        reverseAndPrint(str);
    }

}