#include <cstdio>

using namespace std;

int cmmdc(int x, int y)
{
    int r;

    while (y)
    {
        r = x % y;
        x = y;
        y = r;
    }

    return x;
}

int main()
{
    freopen ("euclid2.in", "r", stdin);
    freopen ("euclid2.out", "w", stdout);

    int t;
    int x;
    int y;

    scanf ("%d\n", &t);
    while (t--)
    {
        scanf ("%d %d\n", &x, &y);
        printf ("%d\n", cmmdc(x, y));
    }

    return 0;
}