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: 'giraffe standing on a pile of rocks reaching up to a branch with its mouth'. Replace the letter 'g' with 'n' in the sentence.

SOLUTION: niraffe standinn on a pile of rocks reachinn up to a branch with its mouth

PROBLEM: Sentence: 'a photo of a silver and yellow fire hydrant'. Replace the letter 'a' with 'q' in the sentence.

SOLUTION:
q photo of q silver qnd yellow fire hydrqnt