#include <iostream>
//#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;

//ifstream cin("szamjegykeveres.in");
//ofstream cout("szamjegykeveres.out");

vector<int>x;

int n,i,db,j;

int main()
{
    cin>>n;
    while(n>0)
    {
        x.push_back(n%10);
        n=n/10;
    }
    sort(x.begin(),x.end());
    for(i=0;i<x.size();++i)
        if(x[i]==0 ) db++;
    else
    {
        j=i;
        break;
    }

    cout<<x[j];
    for(i=0;i<x.size();++i)
        if(i!=j) cout<<x[i];

    return 0;
}