code: public static Alphabet getByFirstLetterOfName(char letter) {
          letter = Character.toLowerCase(letter);
          for (Alphabet alphabet : alphabetsByName.values())
              if (alphabet.getAlphabetName().charAt(0) == letter)
                  return alphabet;
          throw new IllegalArgumentException("No alphabet starting with letter: " + letter);
      }
docs: Searches for instance of {@code Alphabet} using first letter of it's name
  
  @param letter first letter of alphabet's name
  @return instance of {@code Alphabet}