
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) {

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
            StringBuilder builder;
            String line = reader.readLine();
            builder = new StringBuilder(line);
            for (int i = 0; i < line.length(); i++) {
                char word = builder.charAt(i);
                if (Character.isLowerCase(word) == true) {
                    System.out.print(Character.toUpperCase(word));
                } else if (Character.isUpperCase(word) == true) {
                    System.out.print(Character.toLowerCase(word));
                } else {
                    System.out.print(word);
                }
            }
        } catch (IOException e) {
            
        }
        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