class Base62:
    CHARSET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

    @staticmethod
    def encode(input):
        bytes_input = input.encode('utf-8')
        result = []
        value = 0
        bits = 0
        for byte in bytes_input:
            value = (value << 8) | byte
            bits += 8
            while bits >= 6:
                result.append(Base62.CHARSET[(value >> (bits - 6)) & 0x3F])
                bits -= 6
        if bits > 0:
            result.append(Base62.CHARSET[(value << (6 - bits)) & 0x3F])
        return ''.join(result)

    @staticmethod
    def decode(base62_str):
        value = 0
        bits = 0
        bytes_output = []
        for char in base62_str:
            value = (value << 6) | Base62.CHARSET.index(char)
            bits += 6
            if bits >= 8:
                bytes_output.append((value >> (bits - 8)) & 0xFF)
                bits -= 8
        return bytes(bytes_output).decode('utf-8')

# Usage
input_str = "Hello, World!"
encoded = Base62.encode(input_str)
print(f"Encoded: {encoded}")

decoded = Base62.decode(encoded)
print(f"Decoded: {decoded}")