Write a function called RemoveConsonants which removes all the consonants in a given phrase. The upper and lower case of the remaining characters should remain unchanged. The input and output phrases are string scalars. The input string could be any length. Hint: The function should work for both upper and lower case. At the start of the function, the input string scalar should be converted to a character vector, the characters should be manipulated, and the resulting character vector should be converted to a string scalar upon exiting. Restrictions: Loops should not be used. The internal functions char(), string(), and ismember() should be used.