TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'two zebras are snuggling at the zoo in their display area'. Replace the letter 'e' with 'z' in the sentence.

SOLUTION: two zzbras arz snuggling at thz zoo in thzir display arza

PROBLEM: Sentence: 'this poster is advertising high performance with a girl riding a bicycle and some taxis on the street'. Replace the letter 't' with 'f' in the sentence.

SOLUTION: fhis posfer is adverfising high performance wifh a girl riding a bicycle and some faxis on fhe sfreef

PROBLEM: Sentence: 'a group if oeople gathered together to take a picture in the office'. Replace the letter 'a' with 'l' in the sentence.

SOLUTION:
l group if oeople glthered together to tlke l picture in the office