//10812 - Beat the Spread!
import java.util.*;
public class HW11_3A617100_10812 {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int data = sc.nextInt();//幾筆
		for(int i = 0 ; i < data ; i++) {
			int sum = sc.nextInt();//分數總和
			int dif = sc.nextInt();//分數差
			int a,b;//ans
			if(sum%2==0 & dif%2 ==0 & sum>dif ) {
				//a+b=sum  a-b=dif  2a=sum+dif
				a = (sum+dif)/2;
				b = sum - a;
				System.out.print(a+" "+b);
			}else {
				System.out.print("impossible");
			}
		}
	}

}