#!/c/Python34/python
# coding: utf-8


def main():
    n, m = input(), int(input())
    if m == 0:
        print(1)
        return

    last = int(n[-1])
    a, i = [last], 0
    while 1:
        n = str(a[i]*last)
        a.append(int(n[-1]))
        if a[0] == a[-1]:
            del a[-1]
            break
        i += 1

    l = len(a)
    if l < m:
        j = m % l - 1
        if j == -1:
            j = l - 1
        print(a[j])
    else:
        print(a[m - 1])

    return

if __name__ == '__main__':
    main()