import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s = sc.next(); int n = s.length(); String ans = ""; for(int i = 0 ; i < n ; i++) { ans += Character.isUpperCase(s.charAt(i)) ? String.valueOf(s.charAt(i)).toLowerCase() : String.valueOf(s.charAt(i)).toUpperCase(); } System.out.println(ans); } }