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

Ex Input:
Sentence: 'a couple of men playing a game of tennis'. Replace the letter 'n' with 'c' in the sentence.

Ex Output:
a couple of mec playicg a game of teccis

Ex Input:
Sentence: 'a city street with cars and busses near buildings'. Replace the letter 'e' with 'd' in the sentence.

Ex Output:
a city strddt with cars and bussds ndar buildings

Ex Input:
Sentence: 'a bathroom with a sink and a mirror'. Replace the letter 'a' with 'x' in the sentence.

Ex Output:
x bxthroom with x sink xnd x mirror