백준 [ALGORITHM] - 문자열 집합 (14425)

n, m = map(int, input().split())

lst = []
temp = []
ans = dict()

for i in range(n):
    item = input()
    ans[item] = 0

for j in range(m):
    lst.append(input())

for i in range(len(lst)):
    if lst[i] in ans.keys():
        ans[lst[i]] += 1

print(sum(ans.values()))