TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a number of people sitting on chairs near each other'. Replace the letter 'c' with 'm' in the sentence.

SOLUTION: a number of people sitting on mhairs near eamh other

PROBLEM: Sentence: 'a cat sits on the floor next to a purse'. Replace the letter 'a' with 'b' in the sentence.

SOLUTION: b cbt sits on the floor next to b purse

PROBLEM: Sentence: 'a skier posing with a ski board on a slope'. Replace the letter 'i' with 'y' in the sentence.

SOLUTION:
a skyer posyng wyth a sky board on a slope