#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int n;
int cmmdc(int a, int b)
{   while(b!=0)
    {   int r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{   f>>n;
    int x,y;
    for(int i=1;i<=n;i++)
    {   f>>x>>y;
        g<<cmmdc(x,y)<<'\n';
    }
    g.close();
    f.close();
    return 0;
}