#include<stdio.h>
#include<string.h>
long long n;
long long length,len;
char s[35];

void slove(long long leng,long long nth){
	if(nth <= len){
		printf("%c",s[nth-1]);
		return ;
	}
	
	long long half = leng/2;
	long long new_nth = nth-half-1;
	slove(half,new_nth);
}

int main(){
	scanf("%s",s);
	scanf("%lld",&n);
	len = strlen(s);
	length = len;
	while(length < n){
		length*=2;
	}
	slove(length,n);
	return 0;
}