Fill in the blanks to complete the function. The character translator function receives a single lowercase letter, then prints the numeric location of the letter in the English alphabet. For example, $$a$$ would return $1$ and $$b$$ would return $2.$ Currently, this function only supports the letters $$a$,$b$,$c$,$ and $$d$$ It returns "unknown" for all other letters or if the letter is uppercase.