TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a white plate topped with a cut in half sandwich'. Replace the letter 'o' with 'x' in the sentence.

SOLUTION: a white plate txpped with a cut in half sandwich

PROBLEM: Sentence: 'a woman is playing tennis on the tennis court'. Replace the letter 'r' with 'z' in the sentence.

SOLUTION: a woman is playing tennis on the tennis couzt

PROBLEM: Sentence: 'some baseball players are walking around on a field'. Replace the letter 'w' with 'n' in the sentence.

SOLUTION:
some baseball players are nalking around on a field