#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int t;
long euclid(long a, long b)
{
    int c;
    if(a==0 || b==0)
    return a+b;
    else
    {while(a!=b)
   if(a>b)
   a=a-b;
   else
   b=b-a;
    return a;}
}
int main()
{
    int a,b,i,sol;
    fin>>t;
    for(i=1;i<=t;i++)
        {
            fin>>a>>b;
            sol=euclid(a,b);
            fout<<sol<<"\n";
        }
    return 0;
}