"""

"""

N,K = map(int,input().split())
K -= 1

Nlis = list(str(N))
Nlis.reverse()

ans = []

dig = 1
for c in Nlis:
    dig *= int(c)+1
    ans.append( K % dig )
    K //= dig
ans.reverse()
print (int( "".join(map(str,ans)) ))