import sys
input = sys.stdin.readline

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

ANS=[]

for i in range(len(S)-1,-1,-1):
    x=int(S[i])+1
    r=K%x
    ANS.append(r)
    K-=r*x

L=int("".join(map(str,ANS[::-1])))
print(L)