5.3 задача (5 номер)

with open("input.txt", "r") as file:
    res=file.read().replace('\n', ' ').replace('\r', ' ').replace('?', '\n').replace('!', '\n').replace('.', '.''\n').replace(',', '')
ad=res.split('\n')
res_=list(ad)
re=ad
for i in range (0, len(ad)):
    b=str(ad[i])
    k=int()
    k=0
    for j in range (0, len(b)):
        if b[j]!='.':
            k=k+1
    if k==(len(b)):
        re=res_.remove(ad[i])
v=''.join(res_).replace('.', '')
c=v.split(' ')
h=set(c)
with open("input.txt", "r") as file:
    ser=file.read().replace('\n', ' ').replace('\r', ' ').replace('?', ' ').replace('!', ' ').replace('.', ' ').replace(',', '')
a=ser.split(' ')
b=set(a)
d=b.difference(h)
print(d)
f=list(d)
print (len(f))