#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,a[1001],r=0,s=0;
	cin>>n;
	int x=n;
	while(n!=0)
	{
		a[r++]=n%10;
		n=n/10;
		s++;
	}
	int q=s,b=x%10;
	cout<<b;
	return 0;
}