new_contents: def extractChars(text):
      charsList = []
      for char in text.lower():
          if char not in charsList and unicode.isalpha(char):
              charsList.append(char)
      return charsList
          
  def checkio(text):
      text = text.lower()
      chars = extractChars(text)
      C = chars[0]
      C_freq = text.count(C)
      for char in chars:
          if (char < C and text.count(char) == C_freq) or text.count(char) > C_freq:
              C = char
              C_freq = text.count(char)
      return C
  
subject: Create mySolution.py