text: #author Kollen Gruizenga
  #recursive function to return a string S where all "Z" char removed
  
  def noZ(S):
      if len(S) == 0:
          return ''
      elif S[0] == 'Z':
          return noZ(S[1:])
      else:
          return S[0] + noZ(S[1:])
   
  