Count the Vowels
Count how many vowels (a e i o u, case-insensitive) appear in the given string.
Input: one line containing a string S (1 ≤ |S| ≤ 105) of letters and digits.
Output: one integer — the number of vowels in S.
Sample Tests
Input 1
hello
Output 1
2
Input 2
AEIOU
Output 2
5
Discussion (opens after you solve — no spoilers before)
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