TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a group of people hanging around holding umbrellas'. Replace the letter 'p' with 'f' in the sentence.

SOLUTION: a grouf of feofle hanging around holding umbrellas

PROBLEM: Sentence: 'a girl riding a horse is jumping the log'. Replace the letter 'a' with 't' in the sentence.

SOLUTION: t girl riding t horse is jumping the log

PROBLEM: Sentence: 'three men in a park playing a sport'. Replace the letter 'p' with 'w' in the sentence.

SOLUTION:
three men in a wark wlaying a swort