Ground for the house task failed test

I would like to give some feedback about ground for the house task. When I checked the solution, I received an error saying that the correct answer for the extra test 2 should be 50 and my solution gives 40. The area of the house testing is as follows: Fail:house("0000##0000\n#000##000#\n##########\n##000000##\n0########0\n") But when I copied "test house" into my idle, it returned 50 as it supposed to. So I would like to know where have I mistaken. Thank you for your help! From: https://py.checkio.org/mission/ground-for-the-house/solve/

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def house(plan):

import re
k=1
x=re.split(r"\n",plan)
g=[]
b=[]
minm=(len((x[k])))
maxm=0

while k<(len(x)-1):
    for i in range (0,(len(x[k]))):
        if x[k][i]=="#" and i<minm:
                minm=i

            if x[k][i]=="#" and i>maxm:    
            maxm=i
    if minm!=(len((x[k]))) or maxm!=0:
        if minm==maxm:
            g.append(1)
        elif minm!=maxm:
            f=((maxm-minm)+1)
            g.append(f)
    else:
        g.append(0)

    k+=1
    minm=(len((x[k])))
    maxm=0

for i in range((len(g))):
    if g[i]!=0:
        b.append(i)

if b!=[]:
    length=((max(b)-min(b))+1)
    width=max(g)   
    area=length*width
    return area
else:    
    return 0