S先生与P先生谜题
设有两个自然数X、Y，2<=X<=Y<=99,S先生知道这两个数的和S，P先生知道这两个数的积P，
他们二人进行了如下对话：
* S: 我确信你不知道这两个数是什么，但我也不知道。
* P: 一听你说这句话，我就知道这两个数是什么了。
* S: 我也是，现在我也知道了。-Mr. S and Mr. P puzzle has two natural number X, Y, 2
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