TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a pair of planes in an airport lot parked for boarding and exiting'. Replace the letter 'e' with 'o' in the sentence.

SOLUTION: a pair of planos in an airport lot parkod for boarding and oxiting

PROBLEM: Sentence: 'the two zebras standing out in the field'. Replace the letter 'h' with 'i' in the sentence.

SOLUTION: tie two zebras standing out in tie field

PROBLEM: Sentence: 'outside a wide four-story building bicycles are parked'. Replace the letter 'r' with 'b' in the sentence.

SOLUTION:
outside a wide foub-stoby building bicycles abe pabked