#include <bits/stdc++.h>
using namespace std;

int main() {
    int c1=0, c0=0;
    char in;
    cin>>in;
    while(1){
        
        if(in=='1') c1++;
        else if(in=='0') c0++;
        //else break;
        for(int i=c0; i>0; i--)
            cout<<0;
        for(int i=c1; i>0; i--)
            cout<<1;
        cout<<endl;
    }
    return 0;
}