input: 
  def do_algebra(operator, operand):
      """
      Given two lists operator, and operand. The first list has basic algebra operations, and 
      the second list is a list of integers. Use the two given lists to build the algebric 
      expression and return the evaluation of this expression.
  
      The basic algebra operations:
      Addition ( + ) 
      Subtraction ( - ) 
      Multiplication ( * ) 
      Floor division ( // ) 
      Exponentiation ( ** ) 
  
      Example:
      operator['+', '*', '-']
      array = [2, 3, 4, 5]
      result = 2 + 3 * 4 - 5
      => result = 9
  
      Note:
          The length of operator list is equal to the length of operand list minus one.
          Operand is a list of of non-negative integers.
          Operator list has at least one operator, and operand list has at least two operands.
  
      """
  
output: 
      result = operand[0]
      for i in range(len(operator)):
          if operator[i] == '+':
              result += operand[i + 1]
          elif operator[i] == '-':
              result -= operand[i + 1]
          elif operator[i] == '*':
              result *= operand[i + 1]
          elif operator[i] == '//':
              result //= operand[i + 1]
          elif operator[i] == '**':
              result **= operand[i + 1]
      return result
  