Count how many vowels a string contains. Vowels are a, e, i, o, u, in either upper or lower case.
Input
A single line containing the string s.
Output
A single integer: the number of vowels in s.
Count the Vowels
Easystrings
Examples
Example 1
- Input
hello
- Output
2
e and o are vowels — 2.
Example 2
- Input
sky
- Output
0
No vowels — 0.
Example 3
- Input
AEIOU
- Output
5
Upper-case vowels count too — 5.
Constraints
- 1 <= length of s <= 10^4
Hints
Reveal hint 1
Walk through each character and check whether it is one of the ten vowel characters (five letters in two cases).
Reveal hint 2
Put the vowels in a set/string like "aeiouAEIOU" and count characters that belong to it.
Reference solution (spoiler — try it yourself first)
Approach
Iterate over the characters and count those that appear in the vowel set (both cases).
s = input()
print(sum(1 for c in s if c in "aeiouAEIOU"))
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