import java.io.*;
import java.util.*;
import java.math.*;

class Main163 {
	
	public static String solve (String str) {
		String ret = "";
		for (int i = 0; i < str.length(); i++) {
			char c = str.charAt(i);
			if ("Z".compareTo(c + "") < 0)
				ret += String.valueOf((char)(c - 32));
			else
				ret += String.valueOf((char)(c + 32));
		}
		return ret;
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		String line = br.readLine();
		
		System.out.println(solve(line));
	}
}