with open('input.txt', 'r', encoding='utf-8') as f:
    text = f.read()

chars = sorted(list(set(text)))
stoi = {ch: i for i, ch in enumerate(chars)}
itos = {i: ch for i, ch in enumerate(chars)}


def encode(s: str):
    return [stoi[c] for c in s]


def decode(l: list[int]):
    return ''.join([itos[i] for i in l])