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[{<({{(([([[<<()()><<><>>>[<()[]>([]<>)]]{[{()<>}]((()[]){{}{}})}])[({[([]<>)][[<>[]]<{}{}>]}{[[[] (<{(([{{<[([[<()<>>(<>)]<([])[(){}]>]){{[<[]<>>{{}{}}]}({[{}]}[{()[]}{{}<>}])}]>{<<{{<(){}>({}{} ({{(<{{[[<{<[{{}{}}{<>[]}][(<>{}>(()<>)]>}[{<{{}<>}><{()<>}<[]()>>}]>({[{{{}{}}<{}{}>}(((){})[[]<>])]({<[][]>''' close_to_open = {')':'(', ']':'[', '}':'{', '>':'<'} scores_illegal = {')':3, ']':57, '}':1197, '>':25137} scores_incomplete = {'(':1, '[':2, '{':3, '<':4} def parse_line(line): stack = [] for c in line: if c in close_to_open.values(): # ehehehehe who needs separate sets stack.append(c) elif c in close_to_open.keys(): if stack.pop() != close_to_open[c]: # Guaranteed to be in the dict by definition hehehe return scores_illegal[c] return stack def parse_stack(stack): score = 0 for c in reversed(stack): score *= 5 score += scores_incomplete[c] return score pass1 = [parse_line(l) for l in rawinput.split()] # Part 1 print(sum([n for n in pass1 if isinstance(n, int)])) # Part 2 scores = sorted([parse_stack(n) for n in pass1 if isinstance(n, list)]) print(scores[len(scores)//2])