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. -

def letter_translator(letter):
if ___ == "a":
letter_position = 1
elif ___ == "b":
letter_position = 2
elif ___ == "c":
letter_position = 3
elif ___ == "d":
letter_position = 4
___:
letter_position = "unknown"
return ___

print(letter_translator("a")) # Should print 1
print(letter_translator("b")) # Should print 2
print(letter_translator("c")) # Should print 3
print(letter_translator("d")) # Should print 4
print(letter_translator("e")) # Should print unknown
print(letter_translator("A")) # Should print unknown
print(letter_translator("")) # Should print unknown