题解 | 完成括号匹配

m1 = input()

m = m1
#把所有能匹配的通过while循环去掉，剩下的就是不匹配的
while "[]" in m:
    m = m.replace("[]", "")
#统计不匹配的
sum1 = m.count("[")
sum2 = m.count("]")
#补全
for n in range(sum1):
    m1 = m1 + "]"
for n in range(sum2):
    m1 = "[" + m1
print(m1)