#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int n,a,b;
int gcd(int a, int b)
{
	if (!b) return a;
	return gcd(b,a%b);
}
int main ()
{
	f>>n;
	for (;n;n--)
	{
		f>>a>>b;
		g<<gcd(a,b)<<"\n";
	}
}