import java.util.Scanner;
  
class Main{
  public static void main(String[] arg){
    String input;
    StringBuffer output = new StringBuffer();
 
    Scanner in = new Scanner(System.in);

    input = in.nextLine();

    for(int i=0; i<input.length(); i++){
        char ch = input.charAt(i);
        if(Character.isLowerCase(ch))
            output.append(Character.toUpperCase(ch));
        else if(Character.isUpperCase(ch))
            output.append(Character.toLowerCase(ch));
        else
            output.append(ch);
    }

    System.out.println(output.toString());
 
  }
}
/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