TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man is standing at the base ball triangle with bat in tow'. Replace the letter 'n' with 'c' in the sentence.

SOLUTION: a mac is stacdicg at the base ball triacgle with bat ic tow

PROBLEM: Sentence: 'a man is standing on a snowboard, atop a mountain'. Replace the letter 'd' with 'u' in the sentence.

SOLUTION: a man is stanuing on a snowboaru, atop a mountain

PROBLEM: Sentence: 'a woman is smiling and on her cellphone'. Replace the letter 'e' with 'b' in the sentence.

SOLUTION:
a woman is smiling and on hbr cbllphonb