Write a program in Python that takes a program written in "Mini-Power", and outputs the tokens and lexemes into a new file. 

Mini  Power: 

 ->  {; } 

 -> ( | ) 

 -> PRINT ( | ) 

 ->  = ( | ) 

 -> {( | )}($|#|%) 

 ->  (+ | -)  |  

 ->  (* | /)  |  

 ->  ^  | (  ) |  |  

 ->  |   ->  |   -> [(+|-)] {} 

 -> [(+|-)] {}.{} 

 -> ?{( | )}? 

 -> (0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9) 

 -> (a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z) 

The program should run like this: prompt> python lexer.py input.txt Processing input file input.txt 14 tokens produced Result in file input.out prompt>

Example input and outpt: Input: a% = 5.5 ; b# = 3 ; c% = a% + b# ; PRINT "the result is " ; PRINT c%

Ouput: ID a REAL ASSIGN REAL_CONST 5.5 SEMICOLON ID b INTEGER ASSIGN INT_CONST 3 SEMICOLON ID c REAL PLUS ID b INTEGER SEMICOLON PRINT STRING the result is SEMICOLON PRINT ID c REAL