public static String pangrams(String s) {
        HashMap<Character,Character> alphabet = new HashMap<>();
        IntStream.rangeClosed('a', 'z').mapToObj(c -> (char)c).forEach(c -> alphabet.put(c, '0'));
        int counter = alphabet.size();
        

        for(int i = 0; i < s.length(); i++){
            char character = Character.toLowerCase(s.charAt(i));
            if(alphabet.containsKey(character) && alphabet.get(character) == '0'){
                alphabet.put(character, '1');
                counter--;
            }
        }
        
        return counter == 0 ? "pangram" : "not pangram";
    }