TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a close up of a train on train tracks at night'. Replace the letter 'n' with 'm' in the sentence.

SOLUTION: a close up of a traim om traim tracks at might

PROBLEM: Sentence: 'picture of a gothic church with a blue sky in the background'. Replace the letter 'e' with 'i' in the sentence.

SOLUTION: picturi of a gothic church with a blui sky in thi background

PROBLEM: Sentence: 'the black cat is trying to take a nap on the pillow'. Replace the letter 'n' with 't' in the sentence.

SOLUTION:
the black cat is tryitg to take a tap ot the pillow