TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a dog standing near a potted plant outside'. Replace the letter 'a' with 'j' in the sentence.

SOLUTION: j dog stjnding nejr j potted pljnt outside

PROBLEM: Sentence: 'a girl riding a horse is jumping the log'. Replace the letter 'a' with 't' in the sentence.

SOLUTION: t girl riding t horse is jumping the log

PROBLEM: Sentence: 'lose up of various trays of croissants and muffins'. Replace the letter 'n' with 'f' in the sentence.

SOLUTION:
lose up of various trays of croissafts afd muffifs