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