import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

m = 64
n, k = na()
k -= 1
a = [n // (10 ** i) % 10 for i in range(64)]

N = 0
#print(a)
z = 1
for i in range(m):
    #print(k % (a[i] + 1) * z)
    N += k % (a[i] + 1) * z
    k //= a[i] + 1
    z *= 10
print(N)