public static String pangrams(String s) {
    // Write your code here
        int count[] = new int[26];
        
        for(int i = 0; i < s.length(); i++) {
            char ch = Character.toLowerCase(s.charAt(i));
            if(ch >= 'a' && ch <= 'z') { //small letters
            count[ch - 'a']++;   
            }
        }
        
        for(int i = 0; i < count.length; i++) {
            if(count[i] == 0) {
                return "not pangram";
            }
        }
        return "pangram";
    }