TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a bike sitting parked next to a cart in front of some boxes'. Replace the letter 't' with 'x' in the sentence.

SOLUTION: a bike sixxing parked nexx xo a carx in fronx of some boxes

PROBLEM: Sentence: 'a refrigerator with both its doors open in a kitchen'. Replace the letter 'o' with 'x' in the sentence.

SOLUTION: a refrigeratxr with bxth its dxxrs xpen in a kitchen

PROBLEM: Sentence: 'a bowl of fruit and cereal with some slices of fruit next to it'. Replace the letter 'f' with 'c' in the sentence.

SOLUTION:
a bowl oc cruit and cereal with some slices oc cruit next to it