#include<stdio.h>

 int main(){

     int n;

     scanf("%d",&n);

     while( n-- ){

         int sa,sb;

         scanf("%d%d",&sa,&sb);

         if( (sa+sb)%!= ){

             printf("impossible\n");

             continue;

         }

         int a = (sa+sb)/;

         int b = sa-a;

         if( a<||b< ){

             printf("impossible\n");

             continue;

         }

         printf("%d %d\n",a>b?a:b,a>b?b:a);

     }

     return ;

 }