#include <iostream>
#include <fstream>

using namespace std;

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

int a,b,i,n;

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