#include <iostream>
#include <fstream>

using namespace std;

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

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

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