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

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int n,a,b;

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

    return b;
}

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