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

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int main ()
{
    int n,a,b;
    fin>>n;;
    
    for (int i=1; i<=n; i++)
    {
        fin>>a>>b;
        while (a!=b)
        {
            if (a>b) a-=b;
            else b-=a;
        }
        fout<<a<<endl;
    }   
    return 0;
}