#!/usr/local/bin/python3.3
# -*- coding:utf-8 -*-

import sys
import os
import re
def pickup_changefile(files):
    pattern = re.compile(r'^[0-9]')
    for cur_file in files:
        state = pattern.match(cur_file)
        if None != state:
            new_file = "2012"+ cur_file
            os.system('mv ' + cur_file + ' ' + new_file)
        
        
argvs = sys.argv
files = os.listdir('.')

pickup_changefile(files)