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

Ex Input:
Sentence: 'a boy taking a nap with his dog on a bed'. Replace the letter 'o' with 'i' in the sentence.

Ex Output:
a biy taking a nap with his dig in a bed

Ex Input:
Sentence: 'a dirt bike rider that is riding in the mud'. Replace the letter 'a' with 'o' in the sentence.

Ex Output:
o dirt bike rider thot is riding in the mud

Ex Input:
Sentence: 'a beautiful bathroom with marble everything even tub'. Replace the letter 't' with 'i' in the sentence.

Ex Output:
a beauiiful baihroom wiih marble everyihing even iub