#include <fstream>
using namespace std;

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

int n;

int cmmdc ( int a, int b )
{
  if ( a==0 ) return b;
  return cmmdc ( b%a, a );
}
void Citire()
{
	int i,x,y;
	fin>>n;
	for(i=1;i<=n;i++)
	{
		fin>>x>>y;
		fout<<cmmdc(x,y)<<'\n';
	}
}
int main()
{
	Citire();
	return 0;
}