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

Example Input: Sentence: 'a giraffe looking over a fence and another reaching over the fence'. Replace the letter 'l' with 'h' in the sentence.
Example Output: a giraffe hooking over a fence and another reaching over the fence

Example Input: Sentence: 'a toilet and a microwave sitting out for the trash'. Replace the letter 'i' with 's' in the sentence.
Example Output: a toslet and a mscrowave ssttsng out for the trash

Example Input: Sentence: 'a sign for prospect and brady st on a street with a light post'. Replace the letter 'g' with 'k' in the sentence.
Example Output:
a sikn for prospect and brady st on a street with a likht post