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: 'a red stop signed has been altered to say stop hate'. Replace the letter 'e' with 't' in the sentence.

SOLUTION: a rtd stop signtd has bttn alttrtd to say stop hatt

PROBLEM: Sentence: 'two people standing in front of a refrigerator talking about what's on it'. Replace the letter 'l' with 'e' in the sentence.

SOLUTION:
two peopee standing in front of a refrigerator taeking about what's on it