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

Input: Consider Input: Sentence: 'a person is standing in the snow in skis'. Replace the letter 'g' with 'x' in the sentence.

Output: a person is standinx in the snow in skis

Input: Consider 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.

Output: b dog lbying in front of b horses stbll with the horse peeking over the hblf door

Input: Consider Input: Sentence: 'a man at a chair with a wall of clocks behind him'. Replace the letter 'n' with 'w' in the sentence.
Output: a maw at a chair with a wall of clocks behiwd him