TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person snow skiing down a hill while the hold their ski poles'. Replace the letter 'r' with 'g' in the sentence.

SOLUTION: a pegson snow skiing down a hill while the hold theig ski poles

PROBLEM: Sentence: 'there is a stepladder situated over a toilet'. Replace the letter 'r' with 'x' in the sentence.

SOLUTION: thexe is a stepladdex situated ovex a toilet

PROBLEM: Sentence: 'an unknown man making a call on his cellphone'. Replace the letter 'a' with 'f' in the sentence.

SOLUTION:
fn unknown mfn mfking f cfll on his cellphone