import java.util.*;

class Main {
        public static void main(String args[]) {
                try (Scanner sc = new Scanner(System.in)) {
                        String S = sc.nextLine();
                        for (int i = 0; i < S.length(); i++) {
                                if (Character.isUpperCase(S.charAt(i))) {
                                        System.out.print(Character.toLowerCase(S.charAt(i)));
                                } else {
                                        System.out.print(Character.toUpperCase(S.charAt(i)));
                                }
                        }
                        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