#include<cstdio>

using namespace std;

int t, a ,b;

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

    return cmmdc(b, a%b);
}

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

    scanf("%d", &t);

    for(int i = 1; i <= t; i++)
    {
        scanf("%d %d", &a, &b);
        printf("%d\n", cmmdc(a,b));
    }
}