TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a group of people riding skis on a snowy surface'. Replace the letter 'p' with 'i' in the sentence.

SOLUTION: a groui of ieoile riding skis on a snowy surface

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 park with very large, unusual benches carved out of very thick trees'. Replace the letter 'a' with 'i' in the sentence.

SOLUTION:
i pirk with very lirge, unusuil benches cirved out of very thick trees