#include <iostream>
#include <fstream>
using namespace std;
int main()
{

 ifstream f("euclid2.in");
 ofstream g("euclid2.out");
 long int n, a, b, i, r;
 f >> n;

 for( i = 1; i <= n; i++ )
 {

  f >> a >> b ;
  r = a % b;
  while ( r  )
  {

    a = b;
    b = r;
    r = a % b;

  }

 g << b <<'\n';

 }

 g.close();
 f.close();

 return 0;
}