func_code: def countdown(num=3):
      while num != 0:
          print(num)
          num = num - 1
      print('LIFT OFF!')
  
  
  def search(word, letter):
      if letter in word:
          return True
      else:
          return False
  
  
  def index(word, letter):
      if letter not in word:
          print(-1)
      else:
          i = 0
          while word[i] != letter:
              i = i + 1
          print(i)
  
  
  def fibonacci(n):
      a = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
      if n <= 1:
          print(a[n])
      elif n > 1:
          print(a[n - 1] + a[n - 2])