#include<bits/stdc++.h>
using namespace std;
struct c{
	char place[1005];
};
c area[1000002];
char pla[1005];
int main(){
	int a,b;
	scanf("%d%d",&a,&b);
	int sum=0;
	for(int i=1;i<=a;++i){
		gets(area[i].place);
	}
	for(int i=1;i<=b;++i){
		gets(pla);
		for(int j=1;j<=a;++j){
			if(!(strcmp(pla,area[j].place))){
				sum++;
				break;
			}
		}
	}
	cout<<sum;
	return 0;
} //字符串输不进去