#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int cmmdc(int a, int b)
{ 
	int r;
    while(b)
    { 
		r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main ()
{
	int n,a,b,i;
f>>n;
for(i=0;i<n;i++)
{ 
	f>>a>>b;
    g<<cmmdc(a,b);
    g<<"\n";
}
}