pyglatin without changing punctuation marks

Question

Hi i made a pyglatin code:

pyg = 'ay'
original = input("Enter a word:")
if len(original) > 0 and original.isalpha():
    word = original.lower()

    first = word[0]
    new_word = word + first + pyg
    new_word = new_word[1:len(new_word)]
    print(new_word)
else:
    print("empty")

and it works perfectly but i need s.th else. for example if user entered

"rm !"

then the output should be:

"mray !"

i dont punctuation marks like ! , . @ to change.

can anyone help?