查询一段文字 ，找出最长的单词

import re
with open("xx.txt","r",encoding="utf-8") as  f:
    txt =f.read()
print(txt)
c =re.split("W",txt)
print(c)

longest =""
for i in c:

    if len(i) >len(longest):
        longest =i
print(111,longest)