#!/usr/bin/python
import sys
import os

# TIP: rm $(md5sum ./* | duplicate -) 
# that will remove all duplicate files in a directory

def main():
   if len(sys.argv) != 2:
      print("Usage: duplicate <md5sum output>");
      return 0

   file = sys.argv[1]

   try:
      if file == '-':
         handle = sys.stdin
      else:
         handle = open(file)
   except IOError:
      os.write(2,"Couldn't open " + file + " for reading\n")
      return(0)

   filelist = []
   md5list  = []
   indexlist = []
   line = handle.readline()

   while line != '':
      ls = line.split()
      filelist.append(ls[1])
      md5list.append(ls[0])
      line = handle.readline()

   handle.close()

   for x in xrange(0,len(md5list)):
      c = md5list.index(md5list[x])
      indexlist.append ( (filelist[x],c) )

   for x in xrange(0,len(indexlist)):
      if x != indexlist[x][1]:
         print(filelist[x])

main()