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