#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a=n/10;
	int b=n%10;
	int c=b*10+a;
	if(a>b){
		cout<<c;
	}else{
		cout<<c;
	} 
} 
/**************************************************************
	Problem: 1734
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/