class VigenereSolver:
    dictionary = None

    def __init__(self, dictionary:str):
        self.dictionary = dictionary

    def encode(self, text:str, key:str) -> str:
        cypher = ""
        for i in range(len(text)):
            key_letter = key[i % len(key)]
            cypher += self.dictionary[(self.dictionary.find(key_letter) + self.dictionary.find(text[i])) % len(self.dictionary)]

        return cypher

    def decode(self, cypher:str, key: str) -> str:
        text = ""
        for i in range(len(cypher)):
            text += self.dictionary[(len(self.dictionary) + self.dictionary.find(cypher[i]) - self.dictionary.find(key[i % len(key)])) % len(self.dictionary)]

        return text