#include <iostream>
#include <fstream>

using namespace std;
int Cmmdc(int a, int b)
{
    int r;
    while (b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
  return a;
}
int main()
{
    int a, b, n, i;
 ifstream fin ("euclid2.in");
 ofstream fout ("euclid2.out");
 fin>>n;
 for(i=1;i<=n;i++)
 {
    fin>>a>>b;
    fout<<Cmmdc(a,b)<<"\n";
 }
 fout.close ();
    return 0;
}