import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    String str = scanner.nextLine();

    char[] ch = str.toCharArray();

    for (int i = 0; i < str.length(); ++i) {
      if (Character.isLowerCase(ch[i])) ch[i] -= 32;
      else if (Character.isUpperCase(ch[i])) ch[i] += 32;
    }

    System.out.println(ch);
  }
}

/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