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

digit = -1
SUM = 1
for i in reversed(range(len(N))):
    SUM *= int(N[i])+1
    if  SUM > K:
        digit = len(N)-i-1
        break
    if SUM == K:
        digit = len(N)-i
        break

K -= 1
SUM = 1
for i in range(len(N)):
    SUM *= int(N[i])+1

ans = []
for i in range(len(N)):
    SUM //= int(N[i])+1
    ans.append(str(K//SUM))
    K %= SUM

print(int("".join(ans)))