#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main()
{
	int N;
	cin >> N;
	
	vector<string> S(N);
	for( int i = 0; i < N; i++ ) {
		cin >> S[i];
	}
	vector<string> T(N);
	for( int i = 0; i < N; i++ ) {
		cin >> T[i];
	}
	for( int i = 0; i < N; i++ ) {
		if( S[i] != T[i] ) {
			cout << i + 1 << endl;
			return 0;
		}
	}
	return 0;
}