請求各位大佬幫我看一下
哪裡能夠改進


from sys import stdin

op = {'p':'q'}


for s in stdin:
    n = int(s)
    for x in range(n):
        ans = 0
        stack = []
        sen = stdin.readline().replace('.','')
        for k in sen:
            if k in op:
                stack.append(op[k])
            elif stack:
                if k == 'q':
                    g = stack.pop()
                    if g == k:
                        ans += 1
        print(ans)