#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int main()
{
int a,b,c,d;
f>>c;
while (c>=1)
{
    f>>a>>b;
    while (a!=0 && b!=0){
    if (a>b) {
	a=a%b;} else {
	 b=b%a;}}
    c=c-1;
    if (a==0) d=b;
    if (b==0) d=a;
    g<<d<<'\n';a=0;b=0;
     
    }   
     
 
 
return 0;   
}