ALPHABET = str()
ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

def main():
    text = input('Entrez le message à chiffrer: ')
    offset = int(input('Entrez le décalage à utiliser:'))
    message = cesar(text,offset)
    print("Le message chiffré est: ", message)

def cesar(text,offset):
    text = convert_text(text)
    new_text = str()
    
    for char in text:
        if char in ALPHABET:
            new_text += swap(char,offset)
        else:
            new_text += char
        return new_text

    

def convert_text(text):  #supprime les caractères spéciaux
    text = text.lower()

    d = {
            "e" :["é","è","ê","ê"],
            "a" :["à"],
            "c" :["ç"],
            "o" :["ô"],
            "u" :["ù"]

        }
    for char in d:
        for c in d[char]:
            text = text.replace (c, char)

    return text.upper()        

def swap(char, offset):
    index = ALPHABET.find(char)
    return ALPHABET [(index + offset) % 26]


if "main" == "main":
    main()