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

Example Input: Sentence: 'a dog laying in front of a horses stall with the horse peeking over the half door'. Replace the letter 'a' with 'b' in the sentence.
Example Output: b dog lbying in front of b horses stbll with the horse peeking over the hblf door

Example Input: Sentence: 'a male holding a baseball bat standing on a big white star'. Replace the letter 'a' with 'i' in the sentence.
Example Output: i mile holding i bisebill bit stinding on i big white stir

Example Input: Sentence: 'there is an ornate stained glass window at the end of the room'. Replace the letter 'n' with 'w' in the sentence.
Example Output:
there is aw orwate staiwed glass wiwdow at the ewd of the room