func_code: def countdown(num):
      while num >= 1:
          print(num)
          num = num - 1
          time.sleep(0.1)
  
  
  def search(str, letter):
      if letter in str:
          print('True')
      else:
          print('False')
  
  
  def index(str, letter):
      i = 0
      if letter in str:
          letter = letter[0]