TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a yellow fire truck parked in a parking lot'. Replace the letter 'a' with 'y' in the sentence.

SOLUTION: y yellow fire truck pyrked in y pyrking lot

PROBLEM: Sentence: 'a woman rests in bed with her laptop'. Replace the letter 's' with 'e' in the sentence.

SOLUTION: a woman reete in bed with her laptop

PROBLEM: Sentence: 'a freightliner train moving through a train yard'. Replace the letter 'e' with 'o' in the sentence.

SOLUTION:
a froightlinor train moving through a train yard