import sys, time, random
from collections import deque, Counter, defaultdict
def debug(*x):print('debug:',*x, file=sys.stderr)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353

n, k = input().split()

D = len(n)
k = int(k) - 1
ans = []
for i in range(D):
    cnt = 1
    for j in range(i + 1, D):
        cnt *= int(n[j]) + 1
    now = 0
    ncnt = 0
    for j in range(int(n[i]) + 1):
        if ncnt + cnt <= k:
            ncnt += cnt
            now += 1
        else:
            break
    k -= ncnt
    ans.append(now)
    
print(int(''.join(map(str, ans))))