public static String pangrams(String s) {

    char [] strChar = s.toLowerCase().replace(" ", "").toCharArray();
    Set<Character> charSet = new HashSet<>();
    for(Character c : strChar){
        if(c >= 'a' && c <= 'z'){
            charSet.add(c);
        }
    }
    if(charSet.size() == 26){
        return "pangram";
    }else{
        return "not pangram";
    }
}