#include <iostream>
#include <fstream>
using namespace std;
int euclid(int a, int b)
{
    int r;
  while(b)
  {
      r=a%b;
      a=b;
      b=r;

  }
  return a ;
}
int main()
{
     int n,i,x,y;
     ifstream fin ("euclid2.in");
     ofstream fout("euclid2.out");
     fin>>n;
     for(i=1;i<=n;i++)
     {
         fin>>x>>y;
         fout<<euclid(x,y)<<"\n";
     }


    return 0;
}