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

Example Input: Sentence: 'a rare picture of an individual within this image'. Replace the letter 'd' with 'z' in the sentence.
Example Output: a rare picture of an inzivizual within this image

Example Input: Sentence: 'a child taking the paper off a box sitting on the floor'. Replace the letter 'c' with 'b' in the sentence.
Example Output: a bhild taking the paper off a box sitting on the floor

Example Input: Sentence: 'a man holding a tennis racquet on a tennis court'. Replace the letter 'd' with 'q' in the sentence.
Example Output:
a man holqing a tennis racquet on a tennis court