import java.io.*;
import java.util.*;
 
class Main {
 
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        char[] c_array=br.readLine().toCharArray();
        for(char c:c_array){
            if('a'<=c&&c<='z'){ System.out.printf("%c",c-'a'+'A'); }
            else if('A'<=c&&c<='Z'){ System.out.printf("%c",c-'A'+'a'); }
            else System.out.print(c);
        }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