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