N = input()
M = input()

if M == "0":
    print(1)
    exit()

v = int(N[-1])
p = v
loop = [-1]
while not v in loop:
    loop.append(v)
    v *= p
    v %= 10

loop[0] = loop[-1]
loop.pop()

i = 0
for m in M:
    i = (10 * i + int(m)) % len(loop)
print(loop[i])