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

Ex Input:
Sentence: 'a couple of white street signs sitting on top of a pole'. Replace the letter 'n' with 't' in the sentence.

Ex Output:
a couple of white street sigts sittitg ot top of a pole

Ex Input:
Sentence: 'a boy is sitting at a dinner table with his food'. Replace the letter 't' with 'r' in the sentence.

Ex Output:
a boy is sirring ar a dinner rable wirh his food

Ex Input:
Sentence: 'there is a man on a skateboard standing at the top of a ramp'. Replace the letter 'e' with 'j' in the sentence.

Ex Output:
thjrj is a man on a skatjboard standing at thj top of a ramp