#include <fstream>

using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

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

int n, i, a, b;
int main()
{
    fin >> n;
    for (i=1; i<=n; i++){
        fin >> a >> b;
        fout << cmmdc (a, b) << endl;
    }
    return 0;
}