#include <fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
unsigned n,a,b;
int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;;
        a=b;b=r;

    }
    return a;
}
int main()
{
    int h;
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b);
        g<<endl;
    }
    return 0;
}