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

Input: Consider Input: Sentence: 'a person with a cell phone standing next to a train'. Replace the letter 's' with 't' in the sentence.

Output: a perton with a cell phone ttanding next to a train

Input: Consider Input: Sentence: 'a wooden bench near a tree and a stone wall'. Replace the letter 'l' with 'q' in the sentence.

Output: a wooden bench near a tree and a stone waqq

Input: Consider Input: Sentence: 'some sheep reach their necks out so they can eat some hay'. Replace the letter 'n' with 's' in the sentence.
Output: some sheep reach their secks out so they cas eat some hay