#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    int r;
    do
    {
        r=a%b;
        a=b;
        b=r;
    }while(r!=0);
    return a;
}

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");

    int n, i, a, b;

    f>>n;

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

    return 0;
}