import java.util.Scanner;

public class Main {

    static void printBWD(String str, int n) {
        if (n < str.length()) {
            printBWD(str, n + 1);
            System.out.print(str.charAt(n));
        }
        return;
    }

    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.next();
        printBWD(line, 0);
        System.out.println();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz