TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
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 woman is holding a bowl of green brocolli'. Replace the letter 'o' with 'w' in the sentence.

SOLUTION: a wwman is hwlding a bwwl wf green brwcwlli

PROBLEM: Sentence: 'the animal is laying down in the grass'. Replace the letter 's' with 'q' in the sentence.

SOLUTION:
the animal iq laying down in the graqq