#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");

int n,i,x,y;

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

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