TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a couple of kids with rackets on a court'. Replace the letter 'u' with 'd' in the sentence.

SOLUTION: a codple of kids with rackets on a codrt

PROBLEM: Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.

SOLUTION: a couplp of ppoplp that arp pptting a horsp

PROBLEM: Sentence: 'a bus on a curvy road, transporting tourists'. Replace the letter 'o' with 'l' in the sentence.

SOLUTION:
a bus ln a curvy rlad, transplrting tlurists