#!/usr/bin/env python

# $Id: working_week.py,v 1.1 2008/12/10 18:12:50 guest Exp $

#

# Call as working.py | working_week.py

import sys

import datetime

def main():

haveData = False

week = 0

monday = None

lastday = None

for line in sys.stdin:

date, hours = line.split()

year, month, day = date.split('-')

#print "xxx:", year, month, day, "->", hours

day = datetime.date(int(year), int(month), int(day))

if (day.weekday() == 0):

# we have a Monday

# do we have data for the last week?

if (haveData):

# yes, print it

# monday is the last monday we save, lastday is the last day we summed up the hours

print "From %s to %s -> %1.1f hours" % (monday, lastday, float(week) / 10)

# we have data, so start to sum up the weekly work hours

haveData = True

week = int(hours)

# save this Monday in var monday for the next print out

monday = day

elif (haveData):

# we started to sum up weekly work hours

week += int(hours)

# and remember this day in var lastday used for print out

lastday = day

if __name__ == "__main__":

main()