instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'busy city street with pedestrians and cars with lights all around'. Replace the letter 'r' with 'k' in the sentence.
answer:
busy city stkeet with pedestkians and caks with lights all akound

question:
Sentence: 'a person jumping up in the air on a snowboard'. Replace the letter 'r' with 'o' in the sentence.
answer:
a peoson jumping up in the aio on a snowboaod

question:
Sentence: 'a group of people are looking at a sleeping bear'. Replace the letter 'i' with 'v' in the sentence.
answer:
a group of people are lookvng at a sleepvng bear