
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		String data = scn.nextLine();
		char[] datas = data.toCharArray();
		for (int i = 0; i < data.length(); i++) {
			if (Character.isLowerCase(datas[i])) {
				datas[i] = Character.toUpperCase(datas[i]);
			} else if (Character.isUpperCase(datas[i])) {
				datas[i] = Character.toLowerCase(datas[i]);
			}
		}
		String changedData = String.valueOf(datas);
		System.out.println(changedData);
	}
}


/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