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