TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'two men and a dog are standing beside a building'. Replace the letter 'b' with 'y' in the sentence.

SOLUTION: two men and a dog are standing yeside a yuilding

PROBLEM: Sentence: 'a tennis racket is sitting in the middle of a tennis field'. Replace the letter 'i' with 'f' in the sentence.

SOLUTION: a tennfs racket fs sfttfng fn the mfddle of a tennfs ffeld

PROBLEM: Sentence: 'people on a small motorboat ride out on calm water'. Replace the letter 'e' with 'l' in the sentence.

SOLUTION:
plopll on a small motorboat ridl out on calm watlr