Vowel number

#include <iostream>

int main () {
    using std::cin;

    int amount = 0;
    cin >> amount;

    auto is_vowel = [](char letter) {
        for (char a : "aieouy")
            if (letter == a) return 1;
        return 0;
    };


    // Cycle-related block
    char ch;
    int number_of_vowels;

    for (int i = 0; i < amount; i++) {
        cin >> ch;
        number_of_vowels = 0;

            while (ch != '\n') {
                number_of_vowels += is_vowel(ch); // is_vowel returns 0/1
                cin.get(ch); // moving cursor right
            }
        cin.get();
        // std::cout << number_of_vowels << " ";
        std::cout << i << " "; // for testing purposes
    }

    return 0;
}