from typing import TypeAlias
from enum import Enum

class Operation(Enum):
    NOOP = 'noop'
    ADDX = 'addx'

Instruction: TypeAlias = tuple[Operation, int|None]

def parse(filename: str) -> list[Instruction]:
    instructions = []
    with open(filename) as f:
        while line:=f.readline().strip("\n"):
            oper = line.split()
            if len(oper) > 1:
                instructions.append((Operation(oper[0]), int(oper[1])))
            else:
                instructions.append((Operation(oper[0]), None))
    return instructions