#include <iostream> 
#include <fstream>
using namespace std;

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

int euclid(int a, int b)
{
	if(b == 0)
        return a;
    	else return euclid(b, a % b);
} 
 
int main()
{
    int n,a,b;
	fin >> n;
	for (int i = 0; i < n; ++i) {
		fin >> a >> b;
		fout << euclid(a,b)<<endl;
	} 
    return 0;
}