#include <fstream>
using namespace std;

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

int T;

int GCD(int A, int B)
{
  if(!B)
    return A;
  return GCD(B, A % B);
}

int main()
{
    fin >> T;
    while(T--)
      {
        int A,B;
        fin >> A >> B;
        fout << GCD(A,B)<<"\n";
      }
    return 0;
}