TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a dirt bike rider that is riding in the mud'. Replace the letter 'a' with 'o' in the sentence.

SOLUTION: o dirt bike rider thot is riding in the mud

PROBLEM: Sentence: 'a large elephant standing outside beside a tree'. Replace the letter 'e' with 'y' in the sentence.

SOLUTION: a largy ylyphant standing outsidy bysidy a tryy

PROBLEM: Sentence: 'a kid is sitting on a skateboard outside'. Replace the letter 'd' with 'a' in the sentence.

SOLUTION:
a kia is sitting on a skateboara outsiae