#include <fstream>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n;
int a,b;

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

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