print("Give me 4 words")
original_words = set()
for i in range(1, 5):
    response = input('Word ' + str(i) + ', plz: ')
    original_words.add(response)

print('How many words can you remember?')
more_words = 'Y'
remembered_words = set()
while more_words.upper() == 'Y':
    remembered_words.add(input("Give me a word you remember:"))
    more_words = input("Do you remember any more words (Y to give more words): ")

remembered = original_words.intersection(remembered_words)
if len(remembered) > 0:
    print("These are the words your remembered correctly:")
    for w in remembered:
        print('* ' + w)