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

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

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

int main()
{
    int t, x, y;
    fin >> t;
    for(int i = 0; i < t; ++i)
    {
        fin >> x >> y;
        fout << cmmdc(x, y) << '\n';
    }
    return 0;
}