#include <iostream>
#include <fstream>
using namespace std;
int cmmdc(int a,int b)
{
    int c;
    while(a!=b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return b;
}
int main()
{
   ifstream fin("euclid2.in");
   ofstream fout("euclid2.out");
   int n,i,a,b;
   cin>>n;
   for(i=1;i<=n;i++)
   {
       fin>>a>>b;
       fout<<cmmdc(a,b)<<endl;
   }
   fin.close();
   fout.close();
   return 0;
}