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Ask the OP

There are many ways to take input and return output. We've made some standardized ways so that challenges don't have to redefine them every time.

However, for stuff like printing the reciprocal, this is something the OP needs to decide. I don't think it is a stretch of the imagination to think that this could be abused on simpler challenges.

(In essence, the answer here is "no". This isn't an allowed default output format. OP can always override, and for this particular challenge, I'd personally vote to allow it)