TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
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: 'large stuffed toy bear sitting next to tree with assortment of bagged items'. Replace the letter 'y' with 'u' in the sentence.

SOLUTION: large stuffed tou bear sitting next to tree with assortment of bagged items

PROBLEM: Sentence: 'ron paul holding a surfboard next to barrack obama'. Replace the letter 'd' with 'u' in the sentence.

SOLUTION:
ron paul holuing a surfboaru next to barrack obama