#! /usr/bin/env python
# -*- coding: utf-8 -*-

def pluriel(mot):

 ail='bail corail émail soupirail travail vantail vitrail'.split()
 ou='hibou chou genou caillou pou bijou'.split()
 eu='pneu bleu'.split()
 al='aval bal carnaval chacal corral final festival récital regal'.split()
 au='landau sarrau'.split()
 if mot in ail or mot in [x.upper() for x in ail]: return mot.lower()[:-2]+'ux'
 if mot in ou or mot in [x.upper() for x in ou]: return mot.lower() +'x'
 if mot in eu or mot in [x.upper() for x in eu]: return mot.lower()+'s'
 if mot in au or mot in [x.upper() for x in au]: return mot.lower()+'s'
 if mot in al or mot in [x.upper() for x in al]: return mot.lower()+'s'
 if mot[-1] in 'sSxXzZ': return mot
 if mot[-2:] == 'al' or mot[-2:] == 'AL': return mot.lower()[:-1]+'ux'
 if mot[-2:] == 'au' or mot[-2:] == 'AU': return mot.lower()+'x'
 if mot[-2:] == 'eu' or mot[-2:] == 'EU': return mot.lower()+'x'
 if mot is 'oeil' or mot is 'OEIL': return 'yeux'
 if mot is 'ail' or mot is 'AIL': return 'aulx'
 else: return mot.lower()+'s'