#include <cstdio>

using namespace std;

int x,y,n;

int cmmdc(int x,int y)
{
    if(y ==0)
        return x;
    return cmmdc(y,x%y);
}

int main()
{

    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {

    scanf("%d %d",&x,&y);
    printf("%d\n",cmmdc(x,y));

    }
    return 0;
}