#include<stdio.h>
 
int main()
{
    long long int a,b,c,d,e,t;
 
    scanf("%lld",&t);
 
    while(t--)
    {
        scanf("%lld%lld",&a,&b);
 
        if(a>=b)
        {
            c=a+b;
            d=c/2;
            e=d-b;
            if(d+e==a && d-e==b)
            {
                printf("%lld %lld\n",d,e);
            }
            else
            {
                printf("impossible\n");
            }
        }
        else
        {
            printf("impossible\n");
        }
    }
    return 0;
}