#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int T,i,a,b;
    f>>T;
    for(i=1;i<=T;i++)
    {
      f>>a>>b;
      while(a!=b)
      {
          if(a>b)
            a=a-b;
          else b=b-a;
      }
      g<<a<<endl;
    }
    f.close();
    g.close();
    return 0;
}