N,K = map(str,input().split())
K = int(K)
C = []
for i in range(len(N)):
  C.append(int(N[i]))

K -= 1
ans = []
for i in range(len(N)):
  res = 1
  for j in range(i + 1,len(N)):
    res *= C[j] + 1
  k = K // res
  ans.append(str(k))
  K %= res
print(int(''.join(ans)))