#include<fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long t,i,a,b,r;
int main ()
{
	f>>t;
	for(i=1;i<=t;i++)
	   {f>>a>>b;
	    r=a%b;
		while(r)
		     {a=b;
		      b=r;
			  r=a%b;
			 }
		g<<b<<'\n';
	   }
f.close();
g.close();
return 0;
}