TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'several older electronics, including cellular phones and a palm pilot with a  broken screen next to each other in white box enclosure'. Replace the letter 'u' with 't' in the sentence.

SOLUTION: several older electronics, incltding celltlar phones and a palm pilot with a  broken screen next to each other in white box enclostre

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 cake toped with white frosting flowers with chocolate centers'. Replace the letter 'c' with 'g' in the sentence.

SOLUTION:
a gake toped with white frosting flowers with ghogolate genters