N,K=list(map(int,input.split()))
N=str(N)
M=[]
ans=[]
for i in range(len(N)):
	M.append(int(N[i])+1)
for i in range(len(N)):
	cnt=1
	for j in range(i+1,len(N)):
		cnt*=M[j]
	ans.append(K//cnt)
	K=K%cnt
ans="".join(ans)
print(int(ans))