def isAscending(list): return isAscendingHelp(list, len(list) - 1, len(list) - 2)

def isAscendingHelp(list, high, low):
  if high - low == -1:
    return true
  else:
    if len(list) == 0:
      return true
    else:
      if list[high] - list[low] == 1:
        isAscendingHelp(list, high - 1, low - 1)
      else:
        return false