#include <fstream>

using namespace std;

ifstream cin("euclid2.in");
ofstream cout("euclid2.out");

int cmmdc(int a, int b)
{
  while (b)
  {
    int r = a % b;
    a = b;
    b = r;
  }
  return a;
}

int main()
{
  int a, b, n;
  cin >> n;
  for (int i = 1; i <= n; ++i)
  {
    cin >> a >> b;
    cout << cmmdc(a, b) << "\n";
  }
  return 0;
}