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

Example Input: Sentence: 'a man is ordering food from a mobile food truck'. Replace the letter 'r' with 'q' in the sentence.
Example Output: a man is oqdeqing food fqom a mobile food tquck

Example Input: Sentence: 'a man standing next to a parking meter'. Replace the letter 'n' with 'p' in the sentence.
Example Output: a map stapdipg pext to a parkipg meter

Example Input: Sentence: 'the lady sitting on the park bench watches porn on her cell phone'. Replace the letter 'w' with 'c' in the sentence.
Example Output:
the lady sitting on the park bench catches porn on her cell phone