# include <fstream>
using namespace std;

ifstream in("euclid2.in");
ofstream out("euclid2.out");

int cmmdc(int a,int b)
{
	int r;
	while(b!=0)
	{
		r=a%b;
		a=b;
		b=r;
	}
	return a;
}

int main()
{
	int n,a,b,i;
	in>>n;
	for(i=1;i<=n;++i)
	{
		in>>a>>b;
		out<<cmmdc(a,b)<<"\n";
	}
	return 0;
}