N, K = map(int, input().split())

N_str = str(N)

val = [1]
now = 1

for i in range(len(N_str) - 1, 0, -1):
    now *= int(N_str[i]) + 1
    val.append(now)

ans = ""
x = 0
for i in range(len(N_str)):
    v = 0
    for j in range(int(N_str[i]) + 1):
        if j * val[~i] + x > K - 1:
            v = j - 1
            break
    else:
        v = int(N_str[i])

    x += val[~i] * v
    ans += str(v)

print(0 if ans.lstrip("0") == "" else ans.lstrip("0"))