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

Example Input: Sentence: 'a tennis player throwing a ball at the ground'. Replace the letter 'r' with 'f' in the sentence.
Example Output: a tennis playef thfowing a ball at the gfound

Example Input: Sentence: 'a painting of scissors going to cut a chain with a lock'. Replace the letter 'g' with 'v' in the sentence.
Example Output: a paintinv of scissors voinv to cut a chain with a lock

Example Input: Sentence: 'stormtrooper action figures posed in front of pizza'. Replace the letter 'r' with 'm' in the sentence.
Example Output:
stommtmoopem action figumes posed in fmont of pizza