Title: Letter Changes
Level : Easy
Description: For this challenge you will be manipulating characters in a string based off their positions in the alphabet.
Clue : Have the function LetterChanges(str) take the str parameter being passed and modify it using the following algorithm. Replace every letter in the string with the letter following it in the alphabet (ie. c becomes d, z becomes a). Then capitalize every vowel in this new string (a, e, i, o, u) and finally return this modified string.