#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,g,s,b;
    cin>>a;
    g=a/1%10;
    s=a/10%10;
    b=a/100%10;
    if(g<s)swap(g,s);
    if(g<b)swap(g,b);
    if(s<b)swap(s,b);
    cout<<g*100+s*10+b;
    return 0;
}
/**************************************************************
	Problem: 1042
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/