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