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

Ex Input:
Sentence: 'a young baseball player throws the ball as others watch'. Replace the letter 'a' with 'n' in the sentence.

Ex Output:
n young bnsebnll plnyer throws the bnll ns others wntch

Ex Input:
Sentence: 'street signs hanging next to a traffic light on a city street'. Replace the letter 'g' with 'm' in the sentence.

Ex Output:
street simns hanminm next to a traffic limht on a city street

Ex Input:
Sentence: 'an airplane flying over the top of a building'. Replace the letter 'i' with 'q' in the sentence.

Ex Output:
an aqrplane flyqng over the top of a buqldqng