In this task, you need to replace a letter in the sentence with another given letter.
--------
Question: Sentence: 'a man walking a horse on a dirt track'. Replace the letter 't' with 's' in the sentence.

Answer: a man walking a horse on a dirs srack


Question: Sentence: 'a person that is sitting under an umbrella'. Replace the letter 'a' with 'l' in the sentence.

Answer: l person thlt is sitting under ln umbrelll


Question: Sentence: 'several people riding on horses at the beach'. Replace the letter 'e' with 'i' in the sentence.

Answer:
siviral piopli riding on horsis at thi biach