TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'people wait for a train on a snowy sidewalk'. Replace the letter 'n' with 'm' in the sentence.

SOLUTION: people wait for a traim om a smowy sidewalk

PROBLEM: Sentence: 'a memorial with various plaques and american flags on it'. Replace the letter 'a' with 'k' in the sentence.

SOLUTION: k memorikl with vkrious plkques knd kmerickn flkgs on it

PROBLEM: Sentence: 'a bouquet of roses are placed on a table'. Replace the letter 'b' with 'i' in the sentence.

SOLUTION:
a iouquet of roses are placed on a taile