instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a gray and white cat sleeping on top of a laptop computer'. Replace the letter 'l' with 'g' in the sentence.
answer:
a gray and white cat sgeeping on top of a gaptop computer


question:
Sentence: 'a red hydrant is sitting on the sidewalk in the city'. Replace the letter 'n' with 'r' in the sentence.
answer:
a red hydrart is sittirg or the sidewalk ir the city


question:
Sentence: 'a red fire truck being driven by a fire fighter'. Replace the letter 'e' with 'c' in the sentence.
answer:

a rcd firc truck bcing drivcn by a firc fightcr