instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a skater looks ahead as he rides down a ramp'. Replace the letter 'n' with 'm' in the sentence.
answer:
a skater looks ahead as he rides dowm a ramp

question:
Sentence: 'a fire fighter climbs onto the roof of a market with a ladder'. Replace the letter 'r' with 'k' in the sentence.
answer:
a fike fightek climbs onto the koof of a makket with a laddek

question:
Sentence: 'a doughnut on a black and white plate next to a blue coffee cup'. Replace the letter 't' with 'g' in the sentence.
answer:
a doughnug on a black and whige plage nexg go a blue coffee cup