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

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

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

int main()
{
    int n, x, y;

    fin>>n;
    for(int i = 0; i < n; i++)
    {
        fin>>x>>y;
        fout<<cmmdc(x, y)<<'\n';
    }
    fin.close();
    fout.close();
    return 0;
}