#! /usr/bin/env python

import sys, time, os

def main(template):
	today = time.strftime('%Y-%m-%d', time.localtime(time.time()))
	log = open('%s_%s' % (template,today), 'a')
	while 1:
		logline = sys.stdin.readline()
		if today != time.strftime('%Y-%m-%d', time.localtime(time.time())):
			log.close()
			today = time.strftime('%Y-%m-%d', time.localtime(time.time()))
			log = open('%s_%s' % (template,today), 'a')
		log.write('%s %s' % (
			time.strftime('%H:%M:%S', time.localtime(time.time())),
			logline))
		log.flush() # To save log even if the process crashes

if __name__ == '__main__':
	main(sys.argv[1])