import java.util.Scanner;
import java.util.Stack;

public class Reverse {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
	    Stack<Integer> stack = new Stack<>();
	    StringBuilder reversed = new StringBuilder();
	    S.codePoints().forEach(cp -> stack.push(cp));
	    while (!stack.empty()) {
	        reversed.appendCodePoint(stack.pop());
	    }
	    System.out.println(reversed.toString());
	    scanner.close();
	}
}