/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
import java.util.Scanner;
/**
 *
 * @author drevenak3
 */
public class More {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String line;
        while(scan.hasNext()){
            line=scan.nextLine();
            int len=line.length();
            if(line.equals("1")){
                System.out.println("110");
            }else if(line.equals("0")){
                System.out.println("1");
            }else{
                if(line.charAt(len-1)=='0'){
                    System.out.println(line.substring(0, len-1)+"1");
                }else{
                    if(line.charAt(len-2)=='1'){
                        if(line.equals("11")){
                            System.out.println("0");
                        }else{
                            System.out.println(line.substring(0, len-2)+"00");
                        }
                    }else{
                        System.out.println("11"+inv(line));
                    }
                }
            }
        }
    }
    private static String inv(String str){
        StringBuilder s=new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            if(str.charAt(i)=='0')
                s.append('1');
            else
                s.append('0');
        }
        return s.toString();
    }
}