TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a family opens gifts in a room with their dog, while sitting on couches'. Replace the letter 's' with 'l' in the sentence.

SOLUTION: a family openl giftl in a room with their dog, while litting on couchel

PROBLEM: Sentence: 'a girl riding a horse is jumping the log'. Replace the letter 'a' with 't' in the sentence.

SOLUTION: t girl riding t horse is jumping the log

PROBLEM: Sentence: 'a man on the news, watched on the television'. Replace the letter 'o' with 'z' in the sentence.

SOLUTION:
a man zn the news, watched zn the televisizn