AoC day 3 part 1

data = open('input.txt').read().strip()
total = 0

for i in range(len(data)):
    chunk = data[i:]

    if not chunk.startswith('mul('):
        continue

    chunk = chunk[4:] # 4 = "mul(" length

    try:
        subchunk = chunk.split(')',1)[0]
        pair = subchunk.split(',')
        a = int(pair[0])
        b = int(pair[1])
        total += a * b

    except:
        continue

print(total)