#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int main()
{
    int t,i;
    long a,b,r;
    fin >> t;
    for(i=0;i<t;i++)
    {
        fin >> a >> b;
        while(b>0)
        {
            r=a%b;
            a=b;
            b=r;
        }
        fout << a << '\n';
    }
    return 0;
}