import java.util.Scanner;

public class DealCaps{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String password = sc.next();
        String[] ps = password.split("");
        String PS = "";
        for(int i = 0; i < ps.length; i++){
            if(ps[i].toLowerCase().equals(ps[i])){
                PS += ps[i].toUpperCase();
            }else{
                PS += ps[i].toLowerCase();
            }
        }
        System.out.println(PS);
    }
}