#include<fstream>

using namespace std;

int asdf(int a, int b){
    int c;
    while(b){
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}

int a,b,n;

int main(){
    ifstream in("euclid2.in");
    ofstream out("euclid2.out");
    in>>n;

    for(int i=0;i<n;i++)
    {
        in >> a >> b;
        out << asdf(a,b) << '\n';
    }

    in.close();
    out.close();
    return 0;
}