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题目描述

数学中经典的“鸡兔同笼”问题，已知头共x个，脚共y只，问笼中的兔和鸡各有多少只?

输入

头和脚的数量。

输出

兔和鸡各自数量。一个空格隔开。

输入输出样例

输入 #1

30 90

输出 #1

15 15