#include <fstream>
#include <fstream>

using namespace std;

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

int cmmdc(int a, int b){
  if(!b)
    return a;
  return cmmdc(b, a % b);
}


int main()
{
  int t, a, b;
  in >> t;
  for(int i = 0; i < t; ++i){
    in >> a >> b;
    out << cmmdc(a, b) << "\n";
  }
  return 0;
}