#include <cstdio>

using namespace std;

int cmmdc(int a, int b)
{
    if(b == 0)
    {
        return a;
    }
    else
    {
        return cmmdc(b, a % b);
    }
}

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

    int n;
    scanf("%d", &n);

    for(int i = 0; i < n; i++)
    {
        int a, b;
        scanf("%d %d", &a, &b);

        printf("%d\n", cmmdc(a, b));
    }

    return 0;
}