#include <iostream>
#include <fstream>
using namespace std;
int euclid (int a, int b)
{
    int t;
    while (b!=0)
    {
        t=b;
        b=a%b;
        a=t;
    }
    return a;
}
int main()
{
    int n,a,b;
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>n;
    for(int i=0;i<n;i++)
    {
        f>>a>>b;
        g<<euclid(a,b)<<'\n';
    }



    return 0;
}