docs: def letternum(letter):
      """
      Get The Number Corresponding To A Letter
      """
      if not isinstance(letter, str):
          raise TypeError("Invalid letter provided.")
      if not len(letter) == 1:
          raise ValueError("Invalid letter length provided.")
      letter = letter.lower()
      alphaletters = string.ascii_lowercase
      for i in range(len(alphaletters)):
          if letter[0] == alphaletters[i]:
              return i + 1