import java.util.Scanner;

public class No_163 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String password = sc.next();
		char[] pieceOfPassword = password.toCharArray();
		
		for(char c:pieceOfPassword){
			char cLow = Character.toLowerCase(c);
			if(c == cLow){
				System.out.print(Character.toUpperCase(c));
			}
			else{
				System.out.print(Character.toLowerCase(c));
			}
		}
		sc.close();
	}

}