#include    <iostream>
#include    <fstream>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int euclid(int a, int b)
{
     while(b)
     {
         int r=a%b;
         a=b;
         b=r;
     }
     return a;
}

int main()
{
    int a,b,n;
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        fin>>a>>b;
        fout<<euclid(a,b)<<'\n';
    }
}