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

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int n, a, b;

int cmmdc(int a, int b)
{
    if (!b) return a;
    return cmmdc(b, a % b);
}
int main()
{
    f >> n;
    for(int i = 1; i <= n; ++i)
    {
        f >> a >> b;
        g << cmmdc(a, b) << '\n';
    }
    return 0;
}