#!/usr/bin/python
# -*- coding: cp936 -*-
#fielname:raising.py
class ShortInputException(Exception):
     '''自己定義的輸入字符串太短的異常類

拋出ShortInputException異常'''
     def __init__(self,length,atleast):
          Exception.__init__(self)
          self.length=length
          self.atleast=atleast

try:
     s=raw_input("請你輸入一個字符串")
     if len(s)<3:
          raise ShortInputException(len(s),3)
except ShortInputException,x:
     print "你輸入的字符串太短，你的輸入是%d,期望得到%d"%(x.length,x.atleast)
else:
     print"沒有異常發生"