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说明

数学中经典的“鸡兔同笼”问题，已知头共$x$个，脚共$y$只，问笼中的鸡和兔各有多少只？

输入格式

头和脚的数量。

输出格式

鸡和兔各自数量。一个空格隔开。

样例

30 90

15 15