TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person that is sitting under an umbrella'. Replace the letter 'a' with 'l' in the sentence.

SOLUTION: l person thlt is sitting under ln umbrelll

PROBLEM: Sentence: 'a man walking a horse on a dirt track'. Replace the letter 't' with 's' in the sentence.

SOLUTION: a man walking a horse on a dirs srack

PROBLEM: Sentence: 'a child holding a tv remote like a phone'. Replace the letter 'i' with 'b' in the sentence.

SOLUTION:
a chbld holdbng a tv remote lbke a phone