#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
	ifstream f("euclid2.in");
	ofstream g("euclid2.out");
	int t, a, b;
	f >> t;
	int i;
	for (i = 1;i <= t;i++)
	{
		f >> a >> b;
		g<<cmmdc(a, b)<<"\n";
	}
	f.close();
	g.close();
	return 0;
}