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

Example Input: Sentence: 'this is a cute dog sticking his head out of the window of a red car'. Replace the letter 'e' with 'z' in the sentence.
Example Output: this is a cutz dog sticking his hzad out of thz window of a rzd car

Example Input: Sentence: 'a group of people riding on top of snow boarding equipment'. Replace the letter 'e' with 'x' in the sentence.
Example Output: a group of pxoplx riding on top of snow boarding xquipmxnt

Example Input: Sentence: 'a man kneeling next to a motorcycle on a road'. Replace the letter 'e' with 'q' in the sentence.
Example Output:
a man knqqling nqxt to a motorcyclq on a road