import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		String input;
		StringBuilder output = new StringBuilder();
		int offset = 32;
		
		//データの入力
		Scanner sc = new Scanner(System.in);
		input = sc.nextLine();
		
		//文字列を1文字ずつ変換
		for (int i = 0; i < input.length(); i++){
			int temp = input.charAt(i);
			
			if (65 <= temp && temp <= 90){
				temp += offset;
			}else if (97 <= temp && temp <= 122){
				temp -= offset;
			}
			
			output.append((char)temp);
		}
		
		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