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

Ex Input:
Sentence: 'someone playing frisbee with a dog in the middle of a court'. Replace the letter 'd' with 'r' in the sentence.

Ex Output:
someone playing frisbee with a rog in the mirrle of a court

Ex Input:
Sentence: 'a dog laying in front of a horses stall with the horse peeking over the half door'. Replace the letter 'a' with 'b' in the sentence.

Ex Output:
b dog lbying in front of b horses stbll with the horse peeking over the hblf door

Ex Input:
Sentence: 'she has stopped in the plaza to check her email'. Replace the letter 'a' with 'h' in the sentence.

Ex Output:
she hhs stopped in the plhzh to check her emhil