#include<fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int t;
int Euclid_algorithm(int a,int b)
{
    int r=a%b;
    while(r!=0)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return(b);
}
void read_numbers_and_process()
{
    f>>t;
    int i,val1,val2;
    for(i=0;i<t;i++)
    {
        f>>val1;
        f>>val2;
        g<<Euclid_algorithm(val1,val2)<<"\n";
    }
}
int main()
{
    read_numbers_and_process();
}