import fileinput
from collections import deque


input = []
for line in fileinput.input():
    expression, wire = line.strip().split(" -> ")
    input.append((expression.split(), wire))


def simulate(wires):
    def get(signal):
        if signal.isdigit():
            return int(signal)
        else:
            return wires[signal]

    queue = deque(input)
    while queue:
        expression, wire = queue.popleft()
        if wire in wires:
            continue

        try:
            match expression:
                case [signal]:
                    wires[wire] = get(signal)
                case ["NOT", signal]:
                    wires[wire] = ~get(signal)
                case [left, "AND", right]:
                    wires[wire] = get(left) & get(right)
                case [left, "OR", right]:
                    wires[wire] = get(left) | get(right)
                case [left, "LSHIFT", right]:
                    wires[wire] = get(left) << get(right)
                case [left, "RSHIFT", right]:
                    wires[wire] = get(left) >> get(right)
        except KeyError:
            queue.append((expression, wire))

    return wires["a"]


part1 = simulate({})
print("part 1:", part1)

part2 = simulate({"b": part1})
print("part 2:", part2)