def myfunc new_word for index letter in enumerate start if index new_w

def myfunc(s):
    new_word = ""
    for index,letter in enumerate(s, start = 1):
        if index%2==0:
            new_word = new_word+letter.upper()
        elif index%2==1:
            new_word = new_word+letter.lower()
    return new_word