What is wrong with this piece of code? I am trying to create a list given specific strings and an input, then find the largest word and return/print it. def largest(words):

Length = 0
Word = ""

largest_word = ""
num_Words = len(words)

for x in range(0, num_Words, 1):
largest_word = words[x]
largest_length = len(largest_word)
if (largest_length >= Length):
largest_length = Length
largest_word = Word

return largest_word

user_pet = input("Enter a pet: ")
y = ["cat", "dog", "hamster", user_pet]
largest_petname = largest(y)
print(largest_petname)