#include<iostream>
//#include<cmath>
#include<string>
//#include<cstring>
//#include<cstdio>
//#include<algorithm>
using namespace std;
int main(void)
{
	long long n;
	string s;
	cin >> s >> n;
	long long len = s.size();
	while(len < n)
	{
		long long t = len;
		while(n > t) t *= 2;
		n -= t/2+1; 
		if(!n) n = t;
	}
	cout << s[n-1];
	return 0;
}