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

Example Input: Sentence: 'a baseball player running on a baseball field'. Replace the letter 'e' with 'h' in the sentence.
Example Output: a bashball playhr running on a bashball fihld

Example Input: Sentence: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.
Example Output: subwac train approaching the platform of a subwac station

Example Input: Sentence: 'people on a dock near boats in the water'. Replace the letter 'l' with 't' in the sentence.
Example Output:
peopte on a dock near boats in the water