#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d,e,f,g;
	cin>>a;
	b=a%10;
	c=a/10%10;
	d=a/100%10;
	e=b;f=c;g=d;
	if(e<f){
		swap(e,f);
	}
	if(e<g){
		swap(e,g);
	}
	if(f<g){
		swap(f,g);
	}
	cout<<g*100+f*10+e;
}
/**************************************************************
	Problem: 1243
	User: toughuatao1
	Language: C++
	Result: Wrong Answer
****************************************************************/