classify_letter(ch) that takes a single lowercase letter ch and returns "Vowel" if it is one of a, e, i, o, u, and "Consonant" otherwise.classify_letter("e")"Vowel"
"e" is a vowel.
classify_letter("k")"Consonant"
"k" is not a vowel.
Use the `in` operator against a string of vowels, e.g. `"aeiou"`.
This avoids five separate `or` comparisons.