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

Ex Input:
Sentence: 'the kitchen has a big screen tv and a lot of counter space'. Replace the letter 'h' with 'z' in the sentence.

Ex Output:
tze kitczen zas a big screen tv and a lot of counter space


Ex Input:
Sentence: 'a cat sits on the floor next to a purse'. Replace the letter 'a' with 'b' in the sentence.

Ex Output:
b cbt sits on the floor next to b purse


Ex Input:
Sentence: 'an animal sits inside of a bag on a chair'. Replace the letter 'a' with 'z' in the sentence.

Ex Output:

zn znimzl sits inside of z bzg on z chzir