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#!/usr/bin/env python3
# -*- python -*-
'''
median — Calculate the median value for a set of groups
Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
lines = []
try:
while True:
lines.append(input())
except:
pass
get_key = lambda x : x[x.index(' '):] if ' ' in x else ''
get_value = lambda x : x[:x.index(' ')] if ' ' in x else x
lines = [(get_value(line), get_key(line)) for line in lines if not line == '']
lines.sort(key = lambda x : x[1]);
last, values = None, None
lines.append((..., ...))
for value, key in lines:
if last != key:
if last is not None:
values.sort(key = lambda x : int(x))
if len(values) % 2 == 1:
median = values[len(values) // 2]
else:
low = values[len(values) // 2 + 0]
high = values[len(values) // 2 + 1]
median = (int(low) + int(high)) // 2
median = '%%0%ii' % len(high) % median
print(median + last)
last, values = key, []
values.append(value)
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