#include <bits/stdc++.h>
 
#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define forn(i, n) for (int i = 0; i < (int)(n); ++i)
#define for1(i, n) for (int i = 1; i <= (int)(n); ++i)
#define ford(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define fore(i, a, b) for (int i = (int)(a); i <= (int)(b); ++i)
 
using namespace std;
 
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpi;
typedef vector<vi> vvi;
typedef long long i64;
typedef vector<i64> vi64;
typedef vector<vi64> vvi64;
typedef pair<i64, i64> pi64;
typedef double ld;
 
template<class T> bool uin(T &a, T b) { return a > b ? (a = b, true) : false; }
template<class T> bool uax(T &a, T b) { return a < b ? (a = b, true) : false; }


int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.precision(10);
	cout << fixed;
  
	int n;
	cin >> n;
	set<int> a;
	for(int i = 0; i < n; i++){
		int x;
		cin >> x;
		a.insert(x);
	}
	int m;
	cin >> m;
	for(int i = 0; i < m; i++){
		int x;
		cin >> x;
		if(a.count(x))a.erase(x);
		else a.insert(x);
	}
	for(auto i:a)cout << i << '\n';
    return 0;
}

