import java.io.*;

public class Main{
    public static void main(String[]args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        for (char c: str.toCharArray()){
            if(Character.isLowerCase(c)){
                System.out.print(Character.toUpperCase(c));
            }else{
                System.out.print(Character.toLowerCase(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