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

int n,a,b;

int main()
{
    int i,r;
    fin>>n;
    for(i=1; i<=n; i++)
        {fin>>a>>b;
         while(b)
            {r=a%b;
             a=b;
             b=r;
            }
         fout<<a<<"\n";
        }
    fin.close();
    fout<<"\n";
    fout.close();
    return 0;
}