TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a child watching television changing the station with a remote'. Replace the letter 'n' with 'z' in the sentence.

SOLUTION: a child watchizg televisioz chazgizg the statioz with a remote

PROBLEM: Sentence: 'a silly cow licking the camera through a fence'. Replace the letter 't' with 'v' in the sentence.

SOLUTION: a silly cow licking vhe camera vhrough a fence

PROBLEM: Sentence: 'a herd of zebra grazing on a grass covered field'. Replace the letter 'e' with 'y' in the sentence.

SOLUTION:
a hyrd of zybra grazing on a grass covyryd fiyld