import java.util.Scanner;

public class Main {
  public static void log(Object obj) {
    System.out.println(obj.toString());
  }

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    char[] c = s.toCharArray();
    c[c.length-1] = c[c.length-1] == '0' ? '1': '0';
    log(new String(c));
  }
}