#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    int t,a,b,he,ca;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d %d",&he,&ca);
        if((he+ca)%2==0)
        {
            a=(he+ca)/2;
            b=he-a;
            if(b<=0) printf("impossible\n");
            else printf("%d %d\n",a,b);
        }else printf("impossible\n");
    }
    return 0;
}