text: # coding: utf-8
  from math import *
  
  points = ["A", "B", "C"]
  p = [[0] * 2, [0] * 2, [0] * 2]
  
  for i in range(3):
      p[i][0] = int(input("x%d = " %(i + 1)))
      p[i][1] = int(input("y%d = " %(i + 1)))
  
  print("p =", p)
  
  for i in range(3):
      print("%s =" %points[i], p[i])
  
  s = (1 / 2) * abs(((p[1][0] - p[0][0]) * (p[2][1] - p[0][1])) - ((p[1][1] - p[0][1]) * (p[2][0] - p[0][0])))
  print("S =", s)
  
  