import java.util.Scanner;

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

        String str = scan.nextLine();
        String result = "";
        for (int i = 0; i < str.length();i++) {
            String s = str.substring(i, i + 1);
            if (s.equals(s.toLowerCase())) {
                result += s.toUpperCase();
            } else {
                result += s.toLowerCase();
            }
        }
        System.out.println(result);
    }
}
/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