#! /usr/bin/env python
# This Python program sorts and reformats the table of keywords in ref2.tex
import string
l = []
try:
while 1:
l = l + string.split(raw_input())
except EOFError:
pass
l.sort()
for x in l[:]:
while l.count(x) > 1: l.remove(x)
ncols = 5
nrows = (len(l)+ncols-1)/ncols
for i in range(nrows):
for j in range(i, len(l), nrows):
print string.ljust(l[j], 10),
print
