TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a yellow fire hydrant sitting on the sidewalk'. Replace the letter 'o' with 'd' in the sentence.

SOLUTION: a yelldw fire hydrant sitting dn the sidewalk

PROBLEM: Sentence: 'the person rides down the path atop the pink skateboard'. Replace the letter 'e' with 'c' in the sentence.

SOLUTION: thc pcrson ridcs down thc path atop thc pink skatcboard

PROBLEM: Sentence: 'a large clock on the top of pole in the middle of a walk way'. Replace the letter 'f' with 'h' in the sentence.

SOLUTION:
a large clock on the top oh pole in the middle oh a walk way