n, k = map(int, input().split())
k -= 1

A = list(map(int, str(n)))
prod = [1]
for a in A[::-1]:
    prod.append(prod[-1] * (a + 1))
prod = prod[::-1]

ans = ""
for i in range(1, len(prod)):
    t = k // prod[i]
    ans += str(t)
    k %= prod[i]

print(int(ans))