//#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <functional>
#include <algorithm>
#include <map>
#include <cstdio>
#include <cmath>
#include <iomanip>
#include <queue>

using namespace std;

#define rep(i,n) for (int i = 0; i < (n); i++)
#define vi vector<int>
#define vll vector<long long>
#define vb vector<bool>
#define vs vector<string>
#define all(x) x.begin() , x.end()
#define pb push_back
#define eb emplace_back
#define chmax(x,y) (x) = max((x) , (y))
#define chmin(x,y) (x) = min((x) , (y))
#define fi first
#define se second

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

//const int MOD = int(1e9) + 7;
//const int MOD = 998244353;
//const ll MOD = ll(1e9) + 7;
const ll MOD = 998244353;
const ld PI = 3.1415926535897932384626;
const int INF = 1001001001;
const ll LINF = 1001001001001001001;
const int MX = 220000;

ll modpow (ll x , ll p) {
    ll ret = 1;
    while (p) {
        if (p % 2 == 1) {
            ret *= x;
            ret %= MOD;
        }
        x *= x;
        x %= MOD;
        p /= 2;
    }
    return ret;
}

vll fact(MX);
vll factinv(MX);
void init_fact () {
    fact[0] = 1;
    for (int i = 1; i < MX; i++) {
        fact[i] = 1LL * i * fact[i - 1] % MOD;
    }
    for (int i = 0; i < MX; i++) {
        factinv[i] = modpow(fact[i] , MOD - 2);
    }
}

bool is_prime (int x) {
    if (x == 2 || x == 3 || x == 5 || x == 7) {
        return true;
    }
    for (ll i = 2; i*i <= x; i++) {
        if (x % i == 0) {
            return false;
        }
    }
    return true;
}

vb prime_table(MX , true);
void init_prime() {
    for (int i = 2; i < MX; i++) {
        for (int j = i + i; j < MX; j += i) {
            prime_table[j] = false;
        }
    }
    return;
}

map<ll, int> factrization(ll x) {
    map<ll, int> ret;
    for (int i = 2; i*i <= x; i++) {
        while (x % i == 0) {
            ret[i]++;
            x /= i;
        }
    }
    if (x > 1) ret[x]++;
    return ret;
}

ll moddiv (ll a , ll b) { return a * modpow(b , MOD - 2) % MOD; }
ll modsub (ll a , ll b) { if (a >= b) return (a - b) % MOD; else return (MOD - a + b); }
ll nCk (ll n , ll k) { return ((fact[n] * factinv[k] % MOD) * factinv[n - k] % MOD); }
ll nHk (ll n , ll k) { return nCk(n - 1 + k , k); } // 仕切り- 1 + boll を並べる組み合わせ
ll gcd (ll a , ll b) { if (a < b) swap(a , b); if (a % b == 0) return b; else return gcd(b , a % b); }
ll lcm (ll a , ll b) { return a / gcd(a , b) * b; }
ll lin() { ll x; scanf("%lld" , &x); return x; }
int in() { int x; scanf("%d" , &x); return x; }
bool is_palindrome (string s) { string t = s; reverse(all(t)); return (s == t); }
void io_setup() { cout << fixed << setprecision(20); }

void solve () {
    int n , m;
    cin >> n >> m;
    map<int , int> mp1 , mp2;
    rep(i,n) {
        int a = in();
        mp1[a]++;
    }
    rep(i,m) {
        int a = in();
        mp2[a]++;
    }
    vi ans;
    for (auto i : mp1) {
        if (mp2[i.fi] == 0) ans.pb(i.fi);
    }
    for (auto i : mp2) {
        if (mp1[i.fi] == 0) ans.pb(i.fi);
    }
    sort(all(ans));
    int SZ = ans.size();
    rep(i,SZ) {
        cout << ans[i];
        if (i != SZ - 1) cout << " ";
        else cout << endl;
    }
    return;
}

int main() {
    io_setup();
    //init_fact();
    //init_prime();
    solve();
    return 0;
}






#include <bits/stdc++.h>
using namespace std;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

	int n, w; cin >> n >> w;
	cout << n / w << "\n";
	
	return 0;
}