#!/usr/bin/env python

# Challenge 132
#
# TASK #1 > Mirror Dates
# Submitted by: Mark Anderson
# You are given a date (yyyy/mm/dd).
#
# Assuming, the given date is your date of birth. Write a script to find the
# mirror dates of the given date.
#
# Dave Cross has built cool site that does something similar.
#
# Assuming today is 2021/09/22.
# Example 1:
# Input: 2021/09/18
# Output: 2021/09/14, 2021/09/26
#
# On the date you were born, someone who was your current age, would have
# been born on 2021/09/14.
# Someone born today will be your current age on 2021/09/26.
# Example 2:
# Input: 1975/10/10
# Output: 1929/10/27, 2067/09/05
#
# On the date you were born, someone who was your current age, would have
# been born on 1929/10/27.
# Someone born today will be your current age on 2067/09/05.
# Example 3:
# Input: 1967/02/14
# Output: 1912/07/08, 2076/04/30
#
# On the date you were born, someone who was your current age, would have
# been born on 1912/07/08.
# Someone born today will be your current age on 2076/04/30.

import sys
import datetime

def parse_date(s):
    return datetime.datetime.strptime(s, "%Y/%m/%d")

def format_date(d):
    return d.strftime("%Y/%m/%d")

birth = parse_date(sys.argv[1])
today = parse_date(sys.argv[2])
days = today - birth
mirror1 = birth - days
mirror2 = today + days

print(format_date(mirror1)+", "+format_date(mirror2))