import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.ArrayList;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author durec4
 */
public class More {

    StringTokenizer st = new StringTokenizer(" ");
    BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

    boolean hasNextToken() throws IOException {
        while (!st.hasMoreTokens()) {
            String line = input.readLine();
            if (line == null) {
                return false;
            }
            st = new StringTokenizer(line);
        }
        return true;
    }

    String nextToken() throws IOException {
        return (!hasNextToken()) ? null : st.nextToken();
    }

    public static void main(String[] args) throws Exception {
        More instance = new More();
        while (instance.hasNextToken()) {
            instance.run();
        }
    }

    void run() throws Exception {
        String s = nextToken();
        long cislo = Long.parseLong(s);
        byte[] poleByte = new byte[s.length()];
        int index = 0;
        while (cislo > 0) {
            poleByte[index] = (byte) (cislo % 10);
            index++;
            cislo /= 10;
        }

        boolean prenos = true;
        ArrayList newPole = new ArrayList<Byte>();
        for (int i = 0;; i++) {
            if (prenos) {
                if (i % 2 == 0) {
                    if (i >= poleByte.length) {
                        newPole.add(1);
                        prenos = false;
                    } else if (poleByte[i] == 0) {
                        newPole.add(1);
                        prenos = false;
                    } else {
                        newPole.add(0);
                        prenos = true;
                    }
                } else {
                    if (i >= poleByte.length) {
                        newPole.add(1);
                        prenos = true;
                    } else if (poleByte[i] == 0) {
                        newPole.add(1);
                        prenos = true;
                    } else {
                        newPole.add(0);
                        prenos = false;
                    }
                }
            } else {
                if (i >= poleByte.length) {
                    newPole.add(0);
                    prenos = false;
                    break;
                } else {
                    newPole.add(poleByte[i]);
                }
            }
        }
        boolean bolaJedna = false;
        String result = "";
        for (int i = newPole.size()-1; i >= 0; i--) {
            if (bolaJedna == false) {
                if (newPole.get(i) == 0) {
                    continue;
                } else {
                    bolaJedna = true;
                    result += newPole.get(i);
                    //System.out.print(newPole[i]);
                }
            } else {
                result += newPole.get(i);
                //System.out.print(newPole[i]);
            }
        }
        if (result == "") System.out.println("0");
        else System.out.println(result);
    }
}