#include <iostream>
#include <fstream>

using namespace std;

int euclid(int a, int b) {
  if (b == 0)
    return a;
  return euclid(b, a % b);
}

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

  int n, a, b;
  fin >> n;
  for (int i = 0; i < n; ++i) {
    fin >> a >> b;
    fout << euclid(a, b) << "\n";
  }

  return 0;
}