Problem
Given a string, count the number of vowels (a, e, i, o, u - case insensitive).
Input format
Input
input.txt
- A single line containing the string (up to 100 characters, no spaces)
Output format
Output
output.txt
- A single integer: number of vowels
Example
input
OpenAI
output
3
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Sample cases (from the problem)
Sample Case 1
Input
OpenAI
Expected output
3
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