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#!/usr/bin/env python3
# -*- python -*-
'''
median — Calculate the median values 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 : float(x))
if len(values) % 2 == 1:
median = values[len(values) // 2]
else:
low = values[len(values) // 2 - 1]
high = values[len(values) // 2 - 0]
low_plus, low_minus, low_dot = (low[0] == '+'), (low[0] == '-'), ('.' in low)
high_plus, high_minus, high_dot = (high[0] == '+'), (high[0] == '-'), ('.' in high)
if low_plus or low_minus: low = low[1:]
if high_plus or high_minus: high = high[1:]
if not low_dot: low += '.'
if not high_dot: high += '.'
lowi , lowd = [len(x) for x in low.split('.')]
highi, highd = [len(x) for x in high.split('.')]
if lowd < highd: low += '0'
if lowd > highd: high += '0'
mediani = max(lowi, highi)
mediand = max(lowd, highd)
median = float(low) * (-1 if low_minus else 1)
median += float(high) * (-1 if high_minus else 1)
negative, median = median < 0, abs(median) / 2
if (int(low.replace('.', '')[-1]) + int(high.replace('.', '')[-1])) % 2 == 1:
mediand += 1
if mediand == 0:
median = '%%0%ii' % mediani % median
if low_dot or high_dot:
median += '.'
else:
median = '%%0%i.%if' % (max(1, mediani) + mediand + 1, mediand) % median
if mediani == 0:
median = median[1:]
if low_minus and high_minus: prefix = '-'
elif negative: prefix = '-'
elif low_plus or high_plus: prefix = '+'
elif low_minus or high_minus: prefix = '0'
else: prefix = ''
median = prefix + median
print(median + last)
last, values = key, []
values.append(value)
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