Simple Pig Latin

Move the first letter of each word to the end of it, then add "ay" to the end of the word. Leave punctuation marks untouched.

Examples

pig_it('Pig latin is cool') # igPay atinlay siay oolcay
pig_it('Hello world !')     # elloHay orldway !

def pig_it(text):

    words=text.split(" ")

    op=[]

    punct='''!()-[]{};:'"\,<>./?@#$%^&*_~'''

    for word in words:

        if word in punct:

            op.append(word)

        else:

            res=word[1:]+word[0]+"ay"

            op.append(res)

    return " ".join(op)