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

        return cypher

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

        return text