TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man is on a saddled horse with reins'. Replace the letter 's' with 'o' in the sentence.

SOLUTION: a man io on a oaddled horoe with reino

PROBLEM: Sentence: 'a person who is looking at their cell phone'. Replace the letter 'o' with 'b' in the sentence.

SOLUTION: a persbn whb is lbbking at their cell phbne

PROBLEM: Sentence: 'a dog sits in front of a table of supplies'. Replace the letter 'o' with 'u' in the sentence.

SOLUTION:
a dug sits in frunt uf a table uf supplies