2

#include <stdio.h>
int main() {
    int T;
    scanf("%d",&T);
    while (T--) {
        int a,b;
        scanf("%d%d",&a,&b);
        int c = a+b;
        int d = a-b;
        if (b>a || (c%2) != 0 || (d%2) !=0) {
            printf("impossible\n");
        }

        else {
            c = c/2;
            d = d/2;
        printf("%d %d\n",c,d);
        }
    }
    return 0;
}