using namespace std;
#include<cstdio>
int d;

void cmmdc(int a, int b)
{
    if (b)
        cmmdc(b, a % b);
    else
        d = a;
}

int main()
{
    freopen("euclid2.in", "r",stdin);
    freopen("euclid2.out", "w",stdout);
    int a, b, T;
    scanf("%d", &T);
    while (T--)
    {
        scanf("%d %d", &a, &b);
        cmmdc(a, b);
        printf("%d\n", d);
    }
    return 0;
}