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

Ex Input:
Sentence: 'a computer, keyboard, and mouse sitting on a desk'. Replace the letter 's' with 'c' in the sentence.

Ex Output:
a computer, keyboard, and mouce citting on a deck


Ex Input:
Sentence: 'a giraffe looking over a fence and another reaching over the fence'. Replace the letter 'l' with 'h' in the sentence.

Ex Output:
a giraffe hooking over a fence and another reaching over the fence


Ex Input:
Sentence: 'a group of people stands by a bus which is broken down on the side of the road'. Replace the letter 'e' with 'o' in the sentence.

Ex Output:

a group of pooplo stands by a bus which is brokon down on tho sido of tho road