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

Example Input: Sentence: 'a couple of kids are sitting in a field'. Replace the letter 't' with 'v' in the sentence.
Example Output: a couple of kids are sivving in a field

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: 'many different sized desks in a room with many windows'. Replace the letter 'w' with 'a' in the sentence.
Example Output:
many different sized desks in a room aith many aindoas