prices = ['free', 10, 15]
 
while True:
  age = input("Enter your age: ")
 
  if age.lower() == 'quit':
    break
 
  age = int(age)
 
  if age < 3:
    print(f'Your movie ticket is {prices[0]}.')
  elif age < 12:
    print(f'Your movie ticket costs ${prices[1]}.')
  else:
    print(f'Your movie ticket costs ${prices[2]}.')
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