#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a=0,b=0,c=0;
	cin>>n;
	a=n/10;
	b=n%10;
	if(a>b){
	c=a;
	a=b;
	b=c;
	}
	cout<<a<<b;
	return 0;
} 
/**************************************************************
	Problem: 1606
	User: fuhoubin
	Language: C++
	Result: Wrong Answer
****************************************************************/