#include<bits/stdc++.h>
using namespace std;
int main(){ 
    int n,a,b,c;
    cin>>n;
    c=n%10;
    b=(n-c)%100/10;
    a=(n-c-10*b)/100;
    if(a>b&&a>c)
    {
    cout<<a; if(b>c)
    {
    cout<<b<<c;
    }else{
    cout<<c<<b;
    }
    }else
    if(b>a&&b>c)
    { 
    cout<<b; 
    if(c>a)
    {    
    cout<<c<<a;
    }else { cout<<a<<c; 
    }
    }else{ 
    cout<<c; 
    if(b>a)
    {
    cout<<b<<a;
    }else{ 
    cout<<a<<b; }
    }
    return 0;
}