import java.io.*;

class Main{
	public static void main(String args[]) throws IOException{
		DataInputStream d = new DataInputStream(System.in);

		String str = d.readLine();
		String ans = "";

		for(int i = 0; i < str.length(); i++){
			if( (int)'a' <= (int) str.charAt(i) && (int) str.charAt(i) <= (int)'z' ){
				ans += (char)(str.charAt(i) - 32);
			}
			else{
				ans += (char)(str.charAt(i) + 32);
			}

		}

		System.out.println(ans);

	}
}