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#!/usr/bin/env python
import datetime
import sys


def build_to_date(build):
    letter = build[2]
    day = int(build[3:5])

    month = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.index(letter) * 3
    year = 2009 + (month / 12)
    month %= 12

    return datetime.date(year, month + 1, 1) + datetime.timedelta(days=day - 1)


if __name__ == '__main__':
    if len(sys.argv) != 2:
        sys.exit('usage: aday BUILD_NUMBER')

    print build_to_date(sys.argv[1])