TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man with scruffy hair wearing a tie and glasses'. Replace the letter 'r' with 'f' in the sentence.

SOLUTION: a man with scfuffy haif weafing a tie and glasses

PROBLEM: Sentence: 'a person on a snowboard does an air trick'. Replace the letter 'n' with 'o' in the sentence.

SOLUTION: a persoo oo a soowboard does ao air trick

PROBLEM: Sentence: 'a large elephant is staring in front of a fence'. Replace the letter 't' with 'r' in the sentence.

SOLUTION:
a large elephanr is sraring in fronr of a fence