TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person flying a kite on the beach  between some trees'. Replace the letter 's' with 'k' in the sentence.

SOLUTION: a perkon flying a kite on the beach  between kome treek

PROBLEM: Sentence: 'a herd of black cattle grazing and lounging in a green field'. Replace the letter 'a' with 'q' in the sentence.

SOLUTION: q herd of blqck cqttle grqzing qnd lounging in q green field

PROBLEM: Sentence: 'a person on a tennis court jumping and hitting a ball with a racket'. Replace the letter 'o' with 'p' in the sentence.

SOLUTION:
a perspn pn a tennis cpurt jumping and hitting a ball with a racket