#include <fstream>
#include <string>
#include <vector>
 
using namespace std;
 
class Math
{
public:
    static int euclid(int a , int b);
};
 
int Math::euclid(int a , int b)
{
    int r;
 
    while(b != 0)
    {
        r = a % b;
        a = b;
        b = r;
    }
 
    return a;
}
 
int main()
{
    ifstream in("euclid2.in");
    ofstream out("euclid2.out");
 
    int n , a , b;
 
    in >> n;
 
    for(int i = 0 ; i < n ; i++)
    {
        in >> a >> b;
        out << Math::euclid(a , b) << '\n';
    }
 
    in.close();
    out.close();
    return 0;
}