Python如何删除长度小于3的单词

Python如何删除一段英语里长度小于3的单词和出现次数少于2次的单词

n = input()
s = n.split()
for i in s:
  if len(i) < 3 and n.count(i) < 2:
    del s[s.index(i)]
n = " ".join(s)

work_count = defaultdict(int)
for word in text.split():
    if len(word) > 3:
        work_count[word] += 1

words = [k for k, v in work_count.items() if v >= 2]
print(words)