#include <fstream>
using namespace std;
unsigned int n,a,b;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

 unsigned int gcd(unsigned int u, unsigned int v)
{
  // simple cases (termination)
  if (u == v)
    return u;
  if (u == 0)
    return v;
  if (v == 0)
    return u;

  // look for factors of 2
  if (~u & 1) // u is even
   { if (v & 1) // v is odd
      return gcd(u >> 1, v);
    else // both u and v are even
      return gcd(u >> 1, v >> 1) << 1;
   }
  if (~v & 1) // u is odd, v is even
    return gcd(u, v >> 1);

  // reduce larger argument
  if (u > v)
    return gcd((u - v) >> 1, v);
  return gcd((v - u) >> 1, u);
}

int main()
{
    fin>>n;
    for(;n;n--)
    {fin>>a>>b;
    fout<<gcd(a,b)<<"\n";}
    return 0;
}