#include <fstream>
using namespace std;

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

int cmmdc(int a, int b)
{
    while (b > 0) {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}

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