instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.
answer:
subwac train approaching the platform of a subwac station

question:
Sentence: 'a person who is looking at their cell phone'. Replace the letter 'o' with 'b' in the sentence.
answer:
a persbn whb is lbbking at their cell phbne

question:
Sentence: 'a boat sailing close to shore near a lighthouse'. Replace the letter 't' with 'c' in the sentence.
answer:
a boac sailing close co shore near a lighchouse