import java.util.Scanner;

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

        for (String s : S.split("")) {
            if (Character.isLowerCase(s.charAt(0))) {
                System.out.print(Character.toUpperCase(s.charAt(0)));
            } else if (Character.isUpperCase(s.charAt(0))) {
                System.out.print(Character.toLowerCase(s.charAt(0)));
            } else {
                System.out.print(s);
            }
        }
        System.out.println();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz