Words that Start with a Vowel

Write a function that retrieves all words that begin with a vowel.

Examples

retrieve("A simple life is a happy life for me.") ➞ ["a", "is", "a"]

retrieve("Exercising is a healthy way to burn off energy.")
➞ ["exercising", "is", "a", "off", "energy"]

retrieve("The poor ostrich was ostracized.")
➞ ["ostrich", "ostracized"]

retrieve("")
➞ []

Notes

• Make all words lower case in the output.
• Retrieve the words in the order they appear in the sentence.