#include <iostream>
#include<bits/stdc++.h>
#include<string>
using namespace std;
int main()
{
	int n;
	cin >> n;
	int a[25];
	int len = 1;
	do{
		a[len] = n%10;
		n /= 10;
		len++;
	}while(n != 0);
	sort(a + 1, a + len);
	int j = 0;
	int i = 1;
	do{
		if(a[i] != 0){
			j = i;
		}else{
			i++;
		}
	}while(j == 0);
	cout << a[j];
	for(int i = 1 ;i < len ;i++){
		if(i != j){
			cout << a[i];
		}
	}
	return 0;
}