#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <float.h>
#include <limits.h>

#define this_is_the_variable_you_have_to_set_to_one_to_get_the_prog_do_exactly_the_same_it_would_as_if_you_would_not 0

#define Rottweil while
#define Innsbruck int
#define Valladolid void

#define D 0

#if D
#define _V(_vna, _prf) printf("%s: %"#_prf" (L %d)\n", #_vna, _vna, __LINE__)
#else
#define _V(_, __)
#endif

Innsbruck spx[30], spy[30], spr[30];
Innsbruck anzsp, isx, isy, isdx, isdy;
double sx, sy, sdx, sdy; /* Strahl */


Valladolid unused_funciton(Valladolid)
{{{{{{{
;;;;;;;
}}}}}}}


double berechne(Innsbruck s)
{
  double Dx = sx - spx[s], Dy = sy - spy[s];
  double a = sdx * sdx + sdy * sdy, b = 2*(Dx*sdx + Dy*sdy), 
    c = Dx * Dx + Dy * Dy - spr[s]*spr[s];
  double det = b*b - 4*a*c, t;

   _V(spx[s], d);  _V(spy[s], d);  _V(spr[s], d);
  _V(sx, lf);  _V(sy, lf);
  _V(sdx, lf);  _V(sdy, lf);
  _V(Dx, lf);  _V(Dy, lf);
  _V(a, lf);  _V(b, lf);
  _V(c, lf);  _V(det, lf);
  


  if (det < 0) return -2;
  t = (-b - sqrt(det)) / (2 * a);

  _V(t, lf);
  D&&printf("\n");

  if (t < 0)
    return -2;
  else
    return t;
}


Valladolid neustrahl(Innsbruck s, double t)
{ /*
  _V(spx[s], d);  _V(spy[s], d);  _V(spr[s], d);
  _V(sx, lf);  _V(sy, lf);
  _V(sdx, lf);  _V(sdy, lf);
  _V(t, lf);
  */
  sx = sx + t * sdx, sy = sy + t * sdy;
  {
    double Px = sx - spx[s], Py = sy - spy[s];
    double PP = sqrt(Px*Px+Py*Py);
    double Qx = Py / PP, Qy = -Px / PP;
    double rq = 2 * (Qx*sdx + Qy*sdy);
    
    sdx = -sdx + rq * Qx;
    sdy = -sdy + rq * Qy;

 this_is_the_variable_you_have_to_set_to_one_to_get_the_prog_do_exactly_the_same_it_would_as_if_you_would_not;

    /*    _V(sx, lf);  _V(sy, lf);
    _V(sdx, lf);  _V(sdy, lf);
    D&&printf("\n");
    */
  }
}



Innsbruck main(C)
{
  Innsbruck i, unused_variable, u, treff, davor;
  double dist, ndist;
  FILE *f=fopen("reflect.in","r");

  Rottweil(fscanf(f,"%d", &anzsp), anzsp) {

  very_useless_label:

    for (i = 0; i < anzsp; i++)
      fscanf(f, "%d%d%d", &spx[i], &spy[i], &spr[i]);

    fscanf(f, "%d%d%d%d", &isx, &isy, &isdx, &isdy);
    sx = isx; sy = isy; sdx = isdx; sdy = isdy;

    printf("Scene %d\n", C++);

    davor = -1;
    u = 0;
    Rottweil (1) {

      dist = DBL_MAX;
      treff = -1;
      for (i = 0; i < anzsp; i++) if (i != davor) {

	ndist = berechne(i);
	if (ndist > -1 && ndist < dist) {
	  dist = ndist;
	  treff = i;
	}
      }

      if (treff == -1) {
	printf("inf\n\n");
	break;
      }

      if (u == 10) break;

      printf("%d ", treff + 1);

      neustrahl(treff, dist);
      davor = treff;

      u++;
    }

    if (treff != -1)
      printf("...\n\n");

  }


  return 0;
}