Bear On The Stair 2023 Day Seventeen

Can you work out the secret message? Some numbers are on the Naughty List and some are on the Nice List. The numbers on the Naughty List all indicate blanks, but those on the Nice List match letters of the alphabet. Colour the boxes which match the Naughty List numbers in red, and then write the letters into the boxes which match the Nice List numbers. You should discover a Christmassy message! You can print off your own copy of this challenge by clicking here. What does the message say?