#include <iostream>
#include <set>
using namespace std;

int main()
{
	std::set<long> s;
	long n, m;

	cin >> n;

	for (long i = 0; i < n; i++) {
		long t;
		cin >> t;
		s.insert(t);
	}

	cin >> m;

	for (long i = 0; i < m; i++) {
		long t;
		cin >> t;
		if (s.find(t) != s.end())
			s.erase(t);
		else
			s.insert(t);
	}

	for (std::set<long>::iterator itr = s.begin(); itr != s.end(); itr++)
		cout << *itr << endl;

	return 0;
}
