import java.util.*;


public class More {

public static void solve(char[] ca) {

		int allmod = ca.length % 2;

		for (int i = ca.length - 1; i >= 0; i--) {
			if (i % 2 != allmod) {
				if (ca[i] == '0') {
					ca[i] = '1';
					return;
				} else {
					ca[i] = '0';
				}
			} else {
				if (ca[i] == '1') {
					ca[i] = '0';
					return;
				} else {
					ca[i] = '1';
				}
			}
		}
}

public static void main(String[] args) {


	Scanner sc = new Scanner(System.in);

	while (sc.hasNext()) {
		char[] ca = ("00" + sc.next()).toCharArray();
		solve(ca);
		String s = new String(ca);
//		System.out.println(s);
		int kde = s.indexOf('1');
		if (kde < 0) {
			System.out.println("0");
		} else {
			System.out.println(s.substring(kde));
		}
	}


}


}