10-simple.py

import sys

opening = '([{<'
closing = ')]}>'
values = [3, 57, 1197, 25137]

answer1 = 0
scores2 = []
stack = []
while ch := sys.stdin.read(1):
    if ch == '\n':
        # For part 2 only -- alternative: stack = []
        if stack:
            # incomplete string found
            score = 0
            while stack:
                score *= 5
                score += stack.pop() + 1
            scores2.append(score)
    elif ch in opening:
        i = opening.index(ch)
        stack.append(i)
    elif ch in closing:
        i = closing.index(ch)
        if stack.pop() != i:
            stack = []
            answer1 += values[i]
            while ch != '\n':
                ch = sys.stdin.read(1)
                assert ch
    else:
        assert False

print(answer1)

scores2.sort()
while len(scores2) > 2:
    scores2.pop()
    scores2.pop(0)
print(scores2[0])