new_contents: # equilibrium point
  
  def solution(A):
      # write your code in Python 2.7
      tot = sum(A)
      left = 0
      for i in range(len(A)):
          if tot - A[i] == 2 * left:
              return i
          else:
              left += A[i]
      return -1
subject: Create OPP demotest