[백준] 14425번 문자열 집합

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

s=[]
for _ in range(n):
    s.append(input())
find=[]
for _ in range(m):
    find.append(input())
answer=0
for x in s:
   while(True):
        if x not in find:
           break
        find.remove(x)
        answer+=1
print(answer)