Learn python 3 scrabble: how do I make a dictionary ignore casing?

See the last point of this exercise: “make your letter_to_points dictionary able to handle lowercase inputs as well”.

I just did this to the lists as it didn’t take a lot of effort:

letters = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
points = [1, 3, 3, 2, 1, 4, 2, 4, 1, 8, 5, 1, 3, 4, 1, 3, 10, 1, 1, 1, 1, 4, 4, 8, 4, 10, 1, 3, 3, 2, 1, 4, 2, 4, 1, 8, 5, 1, 3, 4, 1, 3, 10, 1, 1, 1, 1, 4, 4, 8, 4, 10]

But surely there is another way of doing without altering the lists that get combined in the dictionary?

Thanks in advance

Say we have a letter and a scores dictionary.

print (scores[letter.upper()])