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#!/usr/local/bin/python3
#
# See https://theweeklychallenge.org/blog/perl-weekly-challenge-154
#
#
# Run as: python ch-1.py < input-file
#
import fileinput
p = {"PERL": 1, "PELR": 1, "PREL": 1, "PRLE": 1, "PLER": 1, "PLRE": 1,
"EPRL": 1, "EPLR": 1, "ERPL": 1, "ERLP": 1, "ELPR": 1, "ELRP": 1,
"REPL": 1, "RELP": 1, "RPEL": 1, "RPLE": 1, "RLEP": 1, "RLPE": 1,
"LERP": 1, "LEPR": 1, "LREP": 1, "LRPE": 1, "LPER": 1, "LPRE": 1,}
for line in fileinput . input ():
p . pop (line . strip ())
for x in p:
print (x)
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