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

int main()


{ int n,i,a,b;
  ifstream f("euclid2.in");
  ofstream g("euclid2.out");
  f>>n;
  for(i=1;i<=n;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;
}