n, k = list(map(int, input().split(' ')))

n = str(n)

choice = [1 for i in range(len(n)+1)]
# print(choice)
for i in range(len(n),0,-1):
    # print(i)
    choice[i-1] = choice[i]*(int(n[i-1])+1)
# print(choice)

ans = ''

k -= 1

if k == 0:
    print(0)
    exit()

for i in range(len(n)):
    ans += str(k//choice[i+1])
    k %= choice[i+1]
    # print(k)
# print(ans)

idx = 0
while ans[idx] == '0':
    idx += 1
# print(idx)
print(ans[idx:])