#include<fstream.h>
#include<conio.h>
main()
    {
    long t,a,b,i,r;
    clrscr();
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>t;
    for(i=1;i<=t;i++)
    {
      f>>a>>b;
      if(a>b)
      {
	while(a%b!=0)
	{
	  r=a%b;
	  a=b;
	  b=r;
	}
	g<<b<<endl;
      }
      else
      {
	while(b%a!=0)
	{
	  r=b%a;
	  b=a;
	  a=r;
	}
	g<<a<<endl;
      }
    }
    }