#2wa,萌新求助，下载不了数据但是真的找不到代码错哪儿了

#include <math.h>
typedef long long ll;
ll n;
char arr[35];
ll len = 0;
void solu(ll x);
void shuchu(ll x, int y); 

void solu(ll x)
{
    ll i = 1;
    ll num1, num2;
    int qujian = 2;
    if(x <= len)
    {
        printf("%c", arr[x]);
        return;
    }
    while(1)
    {
        num1 = len*i;
        num2 = len*i*2;
        if(x > num1 && x <= num2)
        {
            break;
        }
        else
        {
            i *= 2;
            qujian++;
        }
    }
    shuchu(x, qujian);
}

void shuchu(ll x, int y)
{
    if(y == 1)
    {
        printf("%c", arr[x]);
        return;
    }
    x = x - len*pow(2, y - 2) - 1;
    solu(x);
    return;
}

int main()
{
    scanf("%s", arr);
    scanf("%lld", &n);
    while(arr[len] != '\0')
    {
        len++;
    }
    for(int i = len;i >= 0;i--)
    {
        arr[i + 1] = arr[i];
    }
    solu(n);

    return 0;
}