TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a little girl laying on a boogie board next to the ocean'. Replace the letter 't' with 'm' in the sentence.

SOLUTION: a limmle girl laying on a boogie board nexm mo mhe ocean

PROBLEM: Sentence: 'a group of men sitting at a desk with lap top computers'. Replace the letter 'p' with 'z' in the sentence.

SOLUTION: a grouz of men sitting at a desk with laz toz comzuters

PROBLEM: Sentence: 'a yellow train on one out of the two tracks going by'. Replace the letter 'n' with 'v' in the sentence.

SOLUTION:
a yellow traiv ov ove out of the two tracks goivg by