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

Ex Input:
Sentence: 'people wait for a train on a snowy sidewalk'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
people wait for a traim om a smowy sidewalk


Ex Input:
Sentence: 'a long green grain traveling past a white building'. Replace the letter 'w' with 'o' in the sentence.

Ex Output:
a long green grain traveling past a ohite building


Ex Input:
Sentence: 'some bananas with peanut butter and chocolate on a plate'. Replace the letter 'e' with 'j' in the sentence.

Ex Output:

somj bananas with pjanut buttjr and chocolatj on a platj