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 import random 

points = 0
repeat = 0
positive_messages = ['Awesome!', 'Great!','Fantastic!','You got it!']
negative = ['Sorry!', 'That was wrong!']
score_mesaages = ['Score: ', 'Score is: ', 'Your score is: ']

print("Welcome to the DNA quiz game!")

name_input = input("Enter your username >> ")

DNA_length_input = int(input(f"Hi {name_input}, please enter a positive integer for the DNA length >> "))

word_bank = ['C' , 'G' , 'A' , 'T']

def generate_sequence(length):
    sequence = random.choices(word_bank, k = length)
    return ''.join(sequence)

def compute_complement(sequence):
  complement_dict = {
    'A': 'T',
    'T': 'A', 
    'C': 'G',
    'G': 'C'        
    }
  complement = ""  
  for base in sequence:
    complement += complement_dict[base]
  return complement

def compute_reverse(sequence_1):
  result = ""
  for i in s:
    result = i + result
  return result

while True:  
  if DNA_length_input <= 0:
    error_input = int(input("Invalid input, please try again...>>>"))
    DNA_length_input = error_input
  else:
    break

option_input = -1
while option_input != 5:
  option_input = int(input("\nSelect an option [1-4] to answer a question or 5 to quit the game.\nWin the game by scoring at least 10 points! \n \n1. Complement [2 points]  2. Reverse [2 points] 3. Compress [3 points] 4. Expand [3 points] 5. Quit\n> "))
  if option_input == 1:
    sequence = generate_sequence(DNA_length_input)
    complement_input = input(f"What is the complement of {sequence}? ").upper()
    complement = compute_complement(sequence)
    
    if complement_input == complement: 
      points += 2
      print(random.choice(positive_messages), random.choice(score_mesaages), points)
    else:
      points -= 1 
      print (f"That was wrong! The correct answer is {complement} you now have {points} points. \nPlay again?")

  if option_input == 2: 
    sequence_1 = generate_sequence(DNA_length_input)
    reverse_input = input(f"What is the reverse of {sequence_1}? ").upper()
    s = sequence_1
    complement_1 = compute_reverse(sequence_1)

    if reverse_input == complement_1:
      points += 2 
      print(random.choice(positive_messages), random.choice(score_mesaages), points)
    else:
      points -= 1 
      print (f"That was wrong! The correct answer is {complement_1} you now have {points} points. \nPlay again?")