#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int g=n%10,s=n/10%10;
	if(g==0){
		cout<<s;
	}else{
		cout<<g<<s;
	}
	
    return 0;
}

/**************************************************************
	Problem: 1606
	User: liujinhao
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/