#include <iostream>
#include <fstream>
using namespace std;

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

int cmmdc(int a,int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int a,b;
    int n;
    f>>n;
    for(int i=1;i<=n;i++)
        {
            f>>a>>b;
            g<<cmmdc(a,b)<<"\n";
        }

}