/*pku 2653 Pick-up sticks 051221 */
#include<stdio.h>
#define N 100000
typedef struct line{
    float x1,x2,y1,y2;
    long flag;
    }LINE;
int intersect(LINE* l1,LINE* l2)
{
    float dx,dy;
    dx=l1->x1-l1->x2,dy=l1->y1-l1->y2;
    if(  (dx*(l2->y1-l1->y1)-dy*(l2->x1-l1->x1) )*
    (dx*(l2->y2-l1->y1)-dy*(l2->x2-l1->x1) )>0  )
        return 0;
    dx=l2->x1-l2->x2,dy=l2->y1-l2->y2;
    if(  (dx*(l1->y1-l2->y1)-dy*(l1->x1-l2->x1) )*
    (dx*(l1->y2-l2->y1)-dy*(l1->x2-l2->x1) )>0  )
        return 0;
    return 1;
}
LINE top[N];
int main()
{
    float x1,y1,x2,y2;
    long sticks,ii,jj;
    for(;scanf("%ld",&sticks);)
    {
        if(!sticks)
            return;
        for(jj=0;jj<sticks;jj++)
        {
            top[jj].flag=jj+1;
            scanf("%f%f%f%f",&x1,&y1,&x2,&y2);
            (top[jj].x1)=x1,(top[jj].y1)=y1,(top[jj].x2)=x2,(top[jj].y2)=y2;
            for(ii=0;ii<jj;ii++)
                if(top[ii].flag&&intersect(&top[ii],&top[jj]))
                    top[ii].flag=0;
        }
        printf("Top sticks: ");
        for(jj=0;!top[jj].flag;jj++)
            ;
        printf("%ld",top[jj].flag);
        for(jj++;jj<sticks;jj++)
            if(top[jj].flag)
                printf(", %ld",top[jj].flag);
        printf(".\n");
    }
}