Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.

提示：仔细考虑所有可能的情况输入。如果你想要一个挑战，请不要见下文，并问自己什么是可能的输入。

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If you want to buy a camera, please consider carefully which one is the most suitable for you.

在购买相机时，请你慎重行事，仔细考虑哪种相机对您来说是最适合的。

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In most cases, we can only process one return for each delivery invoice. For your benefit, please carefully consider all the products you need to return before calling us.

通常情况下，一张订单只能进行一次退换货操作，所以为了确保您的权益，请您考虑周全后与我们联系。

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