#include<iostream>
#include<fstream>
using namespace std;
int euclid(int a, int b)
{
	int r;
	do
	{	r=a%b;
		a=b;
		b=r;
	}while(r!=0);
	return a;
	
}
int main()
{
	ifstream f("euclid2.in");
	ofstream g("euclid2.out");
	long n,x,y,i;
	f>>n;
	for(i=1;i<=n;i++)	
	{
		f>>x>>y;
		g<<euclid(x,y);
		g<<"\n";
	}

	f.close();
	g.close();
	return 0;
}