#include <iostream>
using namespace std;
int main()
{
    char c;
    int isLowercaseVowel, isUppercaseVowel;
    cout << "Enter an alphabet: ";
    cin >> c;
    // true if c is a lowercase vowel
    isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
    // true if c is an uppercase vowel
    isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
    // true if either isLowercaseVowel or isUppercaseVowel is true
    if (isLowercaseVowel || isUppercaseVowel)
        cout << c << " is a vowel.";
    else
        cout<< c << " is a consonant.";
    return 0;
}