TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'some tracks for a rail way system near a building'. Replace the letter 'a' with 'h' in the sentence.

SOLUTION: some trhcks for h rhil why system nehr h building

PROBLEM: Sentence: 'a man standing next to a parking meter'. Replace the letter 'n' with 'p' in the sentence.

SOLUTION: a map stapdipg pext to a parkipg meter

PROBLEM: Sentence: 'two players engaged in a team doubles tennis match'. Replace the letter 'n' with 'z' in the sentence.

SOLUTION:
two players ezgaged iz a team doubles tezzis match