/*  This Code is Submitted by wywcgs for Problem 2100 on 2005-10-05 at 16:45:19 */ 
#include <stdio.h>

int main()
{
	long p, q, x, y, s, t;
	int test, i;
	
	scanf("%d", &test);
	for(i = 0; i < test; i++) {
		scanf("%ld %ld", &p, &q);
		s = p + q;
		t = p - q;
		if(s%2 == 1 || t%2 == 1 || s < 0 || t < 0) {
			printf("impossible\n");
		} else {
			x = (p + q) / 2;
			y = (p - q) / 2;
			if(x > y) {
				printf("%ld %ld\n", x, y);
			} else {
				printf("%ld %ld\n", y, x);
			}
		}
	}
	
	return 0;
}