TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'this is a tennis player getting ready to serve the ball'. Replace the letter 'h' with 'y' in the sentence.

SOLUTION: tyis is a tennis player getting ready to serve tye ball

PROBLEM: Sentence: 'a long green grain traveling past a white building'. Replace the letter 'w' with 'o' in the sentence.

SOLUTION: a long green grain traveling past a ohite building

PROBLEM: Sentence: 'a woman eating a hot dog on a bun'. Replace the letter 'a' with 'w' in the sentence.

SOLUTION:
w womwn ewting w hot dog on w bun