#include <fstream>
#include <iostream>
using namespace std;
int main()
{
	int a,b,n,i;
	ifstream f("euclid2.in");
	ofstream g("euclid2.out");
	f>>n;
	for (i=0;i<n;i++) {
	f>>a>>b;
	
	while (a!=b)
	{
		if (a>b) a-=b;
		else
			b-=a;
	}
	
	g<<a<<"\n";
	}
	f.close();
	g.close();
	return 0;
}