TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a woman standing in front of a bear in an enclosure'. Replace the letter 'e' with 'r' in the sentence.

SOLUTION: a woman standing in front of a brar in an rnclosurr

PROBLEM: Sentence: 'a building has a clock on the top of it'. Replace the letter 'l' with 'x' in the sentence.

SOLUTION: a buixding has a cxock on the top of it

PROBLEM: Sentence: 'a brown and black dog holding a red frisbee in it's mouth'. Replace the letter 'n' with 'z' in the sentence.

SOLUTION:
a browz azd black dog holdizg a red frisbee iz it's mouth