package com.yxc;

import java.util.Scanner;

public class Main {
    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        StringBuffer sb = new StringBuffer();
        String s1 = null;

        for (int i = str.length() - 1; i >= 0; i--) {
            char curChar = str.charAt(i);
            if (curChar >= 'a' && curChar <= 'z')
                s1 = String.valueOf(curChar).toUpperCase();
            else if (curChar >= 'A' && curChar <= 'Z')
                s1 = String.valueOf(curChar).toLowerCase();
            else
                s1 = String.valueOf(curChar);
                sb.append(s1);
        }

        System.out.println(sb.toString());
    }
}