#include <iostream>
#include <fstream>
using namespace std;
   ifstream f("euclid2.in");
   ofstream g("euclid2.out");
int cmmdc(int a,int b)
{
    int r;
    while(b!=0)
      {
          r=a%b;
          a=b;
          b=r;
      }
      return a;
}
int main()
{
   int T,a,b;
   f>>T;
   while(T--)
   {
       f>>a>>b;
       g<<cmmdc(a,b)<<'\n';
   }
    return 0;
}