# -*- coding: utf-8 -*-
import io, re, sys
f = sys.argv[1]; name = sys.argv[2]
c = io.open(f, encoding='utf-8').read()
i = c.find('data-oj-section="%s"' % name)
j = c.find('oj-explains', i)
seg = c[j:j+1800]
seg = re.sub(r'<[^>]+>', ' ', seg)
seg = re.sub(r'\s+', ' ', seg)
print('--- %s 题目讲解（前段） ---' % name)
print(seg)