#include <iostream>
#include<fstream>

using namespace std;
ifstream f("Euclid.in");
ofstream g("Euclid.out");
int cmmdc(int a, int b)
{int r;
    while (b){
            r=a%b;
            a=b;
            b=r;
}
 return a;
}
int main ()
{int T, a, b;
    f>>T;
    for (int i=1;i<=T;i++){
            f>>a>>b;
            g<<cmmdc(a,b)<<'\n';}


}