#include <iostream>
#include <fstream>
using namespace std;
ifstream in("drept.in");
ofstream out("drept.out");
int gcd(int a, int b) {
   if (b == 0)
        out << a << endl;
    else
        gcd(b, a % b);
}
int main() {

    int T;
    in >> T;
    for(int i =1;i<=T;i++)
    {
        int a,b;
        in >> a >> b;
        gcd(a,b);
    }
    return 0;
}