180423_1427_소트인사이드

	//https://www.acmicpc.net/problem/1427 #include <iostream>
	#include <algorithm>
	#include <string>
	#include <vector>
	using namespace std;
	int main(){
	string num;
	cin >> num;
	vector<int> v;
	for(int i=0; i<num.size(); i++){
	v.push_back(num[i]-'0');
	}
	sort(v.begin(),v.end());
	for(int i=num.size()-1; i>=0; i--){
	cout << v[i];
	}
	return 0;
	}