Write a python function that takes a string as an argument. Then converts this string using the following three rules and finally RETURNS a new string to the function call. If the string is one character long, leave it alone. If the string ends with a vowel (a, e, i, o, u), just add ‘yay’ to the beginning of the string. (e.g., “apple” => “yayapple”) Otherwise, the last letter of the string is moved to the front and ‘ay’ is appended to the end (e.g., “dalek” => “kdaleay”) Assume, the argument string will always be in lowercase letters without any spaces. [ You cannot use slicing. You cannot use any built-in functions except input(), len(), split(), list.append(). ]

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