#include <fstream>
using namespace std;

int a,b,t;

int cmmdc(int a, int b)
{
    if(!b)
        return a;
    return cmmdc(b, a%b);
}

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

    f >> t;
    for(int i=0;i<t;++i)
           f >> a >> b,
           g << cmmdc(a,b) << "\n";
    return 0;
}