#include <iostream>
#include <fstream>

using namespace std;

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

int cmmdc(int x,int y)
{
    int r;
    while(y)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}

int main()
{
    int n,x,y,i;

    f>>n;

    for(i=1;i<=n;i++)
    {
        f>>x>>y;
        g<<cmmdc(x,y)<<'\n';
    }
    return 0;
}