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

Example Input: Sentence: 'this is a bathroom found in a hotel'. Replace the letter 'h' with 's' in the sentence.
Example Output: tsis is a batsroom found in a sotel

Example Input: Sentence: 'a mobile phone and a set of keys on a key chain'. Replace the letter 's' with 'j' in the sentence.
Example Output: a mobile phone and a jet of keyj on a key chain

Example Input: Sentence: 'tanker cars of a train on a bridge over cars'. Replace the letter 't' with 'e' in the sentence.
Example Output:
eanker cars of a erain on a bridge over cars