#include <cstdio>

using namespace std;

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

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