import java.util.Scanner;
import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        char[] strArray = s.toCharArray();
        for(char a : strArray){
        	if(Character.isLowerCase(a)){
        		System.out.print(Character.toUpperCase(a));
        	}
        	else{
        		System.out.print(Character.toLowerCase(a));
        	}
        }
    }
}