#include <fstream>
using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");


int T,a,b,i;


int cmmdc(int a, int b) {

    int r;
    r = a%b;

    while(r!=0) {


        a = b;
        b = r;
        r = a%b;
}

    return b;
}

int main() {



        f>>T;

        for(i = 1; i<=T ; i++) {

            f>>a>>b;

            g<<cmmdc(a,b)<<\n;
        }

        return 0;
}