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

Example Input: Sentence: 'mannequins are beside a motor scooter inside a display case'. Replace the letter 'l' with 'c' in the sentence.
Example Output: mannequins are beside a motor scooter inside a dispcay case

Example Input: Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.
Example Output: u mun who is surfing in u wuve in the oceun

Example Input: Sentence: 'a large airplane flying over a building with people walking below'. Replace the letter 'b' with 'j' in the sentence.
Example Output:
a large airplane flying over a juilding with people walking jelow