TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a couple of men playing a  game of tennis'. Replace the letter 'n' with 'c' in the sentence.

SOLUTION: a couple of mec playicg a  game of teccis

PROBLEM: Sentence: 'a man riding a snowboard on the side of a wall'. Replace the letter 'm' with 'p' in the sentence.

SOLUTION: a pan riding a snowboard on the side of a wall

PROBLEM: Sentence: 'large stuffed toy bear sitting next to tree with assortment of bagged items'. Replace the letter 'y' with 'u' in the sentence.

SOLUTION:
large stuffed tou bear sitting next to tree with assortment of bagged items