#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

int main() {
    // Example vowel list (can be any set of vowel characters)
    std::vector<char> vowels = {'a','e','i','o','u','A','E','I','O','U'};

    std::string s;
    std::cout << "Enter a string: ";
    std::getline(std::cin, s);

    int count = 0;
    for (char c : s) {
        // check if c is in the vowels vector
        if (std::find(vowels.begin(), vowels.end(), c) != vowels.end()) {
            ++count;
        }
    }

    std::cout << "Number of vowels: " << count << '\n';
    return 0;
}