




'''simple docstring'''





def 				UpperCamelCase	(  snake_case   ):




   '''simple docstring'''

   return " ".join(sorted(set(sentence.split()   )   )   )


if __name__ == "__main__":
       import doctest

       doctest.testmod()







'''simple docstring'''





lowercase__			=	{
    '''+''': lambda x, y: x + y,
    '''-''': lambda x, y: x - y,
    '''*''': lambda x, y: x * y,
    '''/''': lambda x, y: x / y,
}


def 				UpperCamelCase	(  snake_case   ):




   '''simple docstring'''

   return c.isdigit()


def 				UpperCamelCase	(  snake_case   ):




   '''simple docstring'''

   SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= []

   # iterate over the string in reverse order
   for c in expression.split()[::-1]:
      # push operand to stack
      if is_operand(snake_case   ):
         stack.append(int(snake_case   )   )

      else:
         # pop values from stack can calculate the result
         # push the result onto the stack again
         SCREAMING_SNAKE_CASE__			:				Dict       						= stack.pop()
         SCREAMING_SNAKE_CASE__			:				Any       						= stack.pop()
         stack.append(calc[c](snake_case	,     snake_case   )   )

   return stack.pop()


# Driver code
if __name__ == "__main__":
       lowercase__			=	'''+ 9 * 2 6'''
       print(evaluate(test_expression))

       lowercase__			=	'''/ * 10 2 + 4 1 '''
       print(evaluate(test_expression))

