#include <iostream>
#include <fstream>
using namespace std;
int n,i,r,a,b;
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>n;
    for(i=1; i<=n; i++)
    {
        f>>a>>b;
       r=a%b;
       while(r!=0)
       {
           a=b;
           b=r;
           r=a%b;
       }
        g<<b<<"\n";
    }
    return 0;
}