# 0611.py

class vettore:
  def __init__(A,x,y,z): A(x,y,z)
  def __call__(A,x,y,z): A.x=float(x); A.y=float(y); A.z=float(z)
  def __add__(A,B): return vettore(A.x+B.x,A.y+B.y,A.z+B.z)
  def __mul__(A,t): return vettore(A.x*t,A.y*t,A.z*t)
  def __rmul__(A,t): return A*t
  def coeff(A): return [A.x,A.y,A.z]
  def __mod__ (A,B): return A.x*B.x+A.y*B.y+A.z*B.z
  def __and__ (A,B):
    (x,y,z)=A.coeff(); (u,v,w)=B.coeff()
    return vettore(y*w-z*v,z*u-x*w,x*v-y*u)
  def __str__ (A): return '%.2f %.2f %.2f' %(A.x,A.y,A.z)
  def lun (A): (x,y,z)=A.coeff(); return math.sqrt(x*x+y*y+z*z)

a=vettore(3,5,7)
print (a)
# 3.00 5.00 7.00
a(8,2,1)
print (a)
# 8.00 2.00 1.00