In this task, you need to replace a letter in the sentence with another given letter.

Example Input: Sentence: 'the two boys are eating large carrots while sitting on a blanket'. Replace the letter 'a' with 'q' in the sentence.
Example Output: the two boys qre eqting lqrge cqrrots while sitting on q blqnket

Example Input: Sentence: 'woman pushing a cart of luggage in a transportation terminal'. Replace the letter 'a' with 'w' in the sentence.
Example Output: womwn pushing w cwrt of luggwge in w trwnsportwtion terminwl

Example Input: Sentence: 'there is white rice and broccoli on the plate'. Replace the letter 'h' with 'c' in the sentence.
Example Output:
tcere is wcite rice and broccoli on tce plate