在霍格沃茨找零钱
如果你是哈利·波特迷，你会知道魔法世界有它自己的货币系统 —— 就如海格告诉哈利的：“十七个银西可(Sickle)兑一个加隆(Galleon)，二
十九个纳特(Knut)兑一个西可，很容易。”现在，给定哈利应付的价钱P和他实付的钱A，你的任务是写一个程序来计算他应该被找的零钱。
输入在1行中分别给出P和A，格式为“Galleon.Sickle.Knut”，其间用1个空格分隔。这里Galleon是[0, 107]]区间内的整数，Sickle是[0,
17)区间内的整数，Knut是[0, 29)区间内的整数。
在一行中用与输入同样的格式输出哈利应该被找的零钱。如果他没带够钱，那么输出的应该是负数。
10.16.27 14.1.28
3.2.1
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