33.py

f = open("33.in")
a = 0
b = 0
c = 0
prog = []
for line in f.readlines():
    if "A" in line:
        a = int(line.removeprefix("Register A: "))
    if "B" in line:
        b = int(line.removeprefix("Register B: "))
    if "C" in line:
        c = int(line.removeprefix("Register C: "))
    if "P" in line:
        prog = list(map(int, line.removeprefix("Program: ").split(",")))

output = []
pointer = 0
while pointer < len(prog):
    inst = prog[pointer]
    combo = prog[pointer+1]
    literal = prog[pointer+1]
    if combo == 4:
        combo = a
    elif combo == 5:
        combo = b
    elif combo == 6:
        combo = c
    if inst == 0:
        a = int(a / 2**combo)
        pointer += 2
        continue
    if inst == 1:
        b = b ^ literal
        pointer += 2
        continue
    if inst == 2:
        b = combo % 8
        pointer += 2
        continue
    if inst == 3:
        if a != 0:
            pointer = literal
            continue
        pointer += 2
        continue
    if inst == 4:
        b = b ^ c
        pointer += 2
        continue
    if inst == 5:
        output.append(combo % 8)
        pointer += 2
        continue
    if inst == 6:
        b = int(a / 2**combo)
        pointer += 2
        continue
    if inst == 7:
        c = int(a / 2**combo)
        pointer += 2
        continue
print(",".join(map(str, output)))