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diff --git a/src/median b/src/median
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+++ b/src/median
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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)
+