import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		char[] s = sc.next().toCharArray();
		sc.close();

		int n = s.length - 1;
		if (s[n] == '0') {
			s[n] = '1';
		} else {
			s[n] = '0';
		}
		System.out.println(s);
	}
}