Return how many vowels (a, e, i, o, u, in either case) appear in the string s. The letter y does not count.
Examples
Input: s = "Programming"
Output: 3
Input: s = "RHYTHM"
Output: 0
Constraints
0 <= len(s) <= 5000smay contain letters, digits, spaces and punctuation
Goals
- Loop over each character of a string
- Test membership with `in`
- Ignore letter case