TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a herd of zebra stand together and eat grass'. Replace the letter 'n' with 'r' in the sentence.

SOLUTION: a herd of zebra stard together ard eat grass

PROBLEM: Sentence: 'a hand holding part of a sponge with scissors nearby'. Replace the letter 'o' with 'e' in the sentence.

SOLUTION: a hand helding part ef a spenge with scissers nearby

PROBLEM: Sentence: 'a baseball player that is up to bat'. Replace the letter 'a' with 'n' in the sentence.

SOLUTION:
n bnsebnll plnyer thnt is up to bnt