instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'people walk through a local fruit market in a city'. Replace the letter 'e' with 'n' in the sentence.
answer:
pnopln walk through a local fruit marknt in a city


question:
Sentence: 'a computer, keyboard, and mouse sitting on a desk'. Replace the letter 's' with 'c' in the sentence.
answer:
a computer, keyboard, and mouce citting on a deck


question:
Sentence: 'three people walking to a big green train'. Replace the letter 'e' with 'v' in the sentence.
answer:

thrvv pvoplv walking to a big grvvn train