# -*- coding: utf-8 -*-


def Mystere(n):
    """ entier -> chaine de caractères
    fonctionnement : mystère !"""
    
    chaine = "Ih u a cqyranfm-wiynxm kyhhm sénézafyqnc, nqc angêfzmc qnf kyc mn zqifm gm tzqszakkm,\
 jyf hm cmgqnj vqkkm, mf jmtiyc fqif gm fmktc, nqic ahhqnc êfzm hmc tzmkymzc à mnfmnjzm tazhmz h'qzjynafmiz.\
[...] Atzèc wimhwimc ghysnqfmkmnfc mrtézykmnfair, hmc hikyèzmc c'éfadhyzmnf ciz in zufvkm appayzé, mn kêkm fmktc\
 wi'in jqir kizkizm szalm attazayccayf ciz hm ganah aijyq. [...] \n \
 - La zétqncm à ha szanjm Qimcfyqn... \n \
 - Oiy... ! \n \
 - Dm ha Vym, jm h'Unylmzc mf ji Rmcfm... [...] \n \
 - Oiy... ! \n \
 - C'mcf, jyf Pmncémc Pzqpqnjmc, kazwianf inm taicm. \n \
 - Oiy... !?"

    res = ""
    if n>len(chaine):
        n=len(chaine)
    for i in range(0,n):
        if  ord(chaine[i]) >= 97 and ord(chaine[i]) <= 122 :
            c = chr(((ord(chaine[i])-97)*9)%26+97)
        else:
            c = chaine[i]
        res = res + c
    return res