#include <iostream>
using namespace std;
int main()
{
	int n,a,b;
	cin>>n;
	while(n--)
	{
		cin>>a;
		cin>>b;
		if( b > a || (a-b) % 2 ) 
			cout<<"impossible"<<endl;
		else
			cout<<(a+b)/2<<" "<<(a-b)/2<<endl;
		
	}
	return 0;
}