#include <bits/stdc++.h>
using namespace std;

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

int cmmdc(int a, int b)
{
    if(b==0)
        return a;
    return cmmdc(b, a % b);
}

int main()
{
    int n;
    f >> n;
    for(int i=1;i<=n;i++)
    {
        int a,b;
        f >> a >> b;

        g << cmmdc(a,b) << "\n";
    }

    return 0;
}