public class Solution {
    public int countConsonants(String text) {
        
            Set<Character> vowels = Set.of('a','e','i','o','u');

            int count = 0;

            for (char s: text.toCharArray()){

                char lower = Character.toLowerCase(s);

                boolean isConsonant = Character.isAlphabetic(lower) && !vowels.contains(lower);

                if (isConsonant){
                    count++;
                }

            }

            return count;
    }
}