#include <cstdio>

using namespace std;
int t, a, b, i;
int cmmdc(int a, int b)
{
    if(!b) return a;
    else return cmmdc(b, a%b);
}
int main()
{
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    scanf("%d", &t);
    for(i=1;i<=t;i++)
    {
        scanf("%d%d", &a, &b);
        printf("%d\n", cmmdc(a,b));
    }
    return 0;
}