#include<iostream.h>
#include<fstream.h>

int t, a, b;


int cmmdc(int a, int b)
{

	if (!b) return a;
	return cmmdc(b, a%b);

}



int main(void)
{
	ifstream f("euclid2.in");
	ofstream g("euclid2.out");
	f >> t;
	for(t;t;--t)

	{
		f >> a >> b;
		g << cmmdc(a, b) << endl;
	}
	return 0;
}