#include <cstdio>

using namespace std;
int n,x,y;
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=0;i<n;i++)
    {
        scanf("%d %d",&x,&y);
        printf("%d\n",cmmdc(x,y));
    }

    return 0;
}