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

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

int n,a,b,i;

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

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        {
            fin>>a>>b;
            fout<<cmmdc()<<'\n';
        }
    return 0;
}