#include<fstream.h>
ifstream f("euclid2.in");
ofstream g("euclid2.out");
using namespace std;
long euclid(long a,long b)
{ if (b==0)return a;
else return euclid(b,a%b);}

   int main()
   {long t,a,b;
   f>>t;
   for (long i=1;i<=t;i++)
    {f>>a>>b;
    g<<euclid(a,b)<<endl;}

    f.close();g.close(); return 0;
    }