TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a black and white image of a vehicle that is decorated like a dog'. Replace the letter 'a' with 'p' in the sentence.

SOLUTION: p blpck pnd white impge of p vehicle thpt is decorpted like p dog

PROBLEM: Sentence: 'a little girl is sitting in a suitcase in a library'. Replace the letter 't' with 'l' in the sentence.

SOLUTION: a lillle girl is silling in a suilcase in a library

PROBLEM: Sentence: 'a pile of orange sitting on a market shelf'. Replace the letter 't' with 'r' in the sentence.

SOLUTION:
a pile of orange sirring on a marker shelf