TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person is riding a skateboard in a skateboard park'. Replace the letter 'a' with 'o' in the sentence.

SOLUTION: o person is riding o skoteboord in o skoteboord pork

PROBLEM: Sentence: 'a person on a snow board flying through the air'. Replace the letter 'f' with 'n' in the sentence.

SOLUTION: a person on a snow board nlying through the air

PROBLEM: Sentence: 'a smiling man stands in the dirty playing with a frisbee'. Replace the letter 'a' with 'c' in the sentence.

SOLUTION:
c smiling mcn stcnds in the dirty plcying with c frisbee