3.cpp

#include <bits/stdc++.h>
using namespace std;
//
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mx 100010
#define mod 1000000007
#define inf INT_MAX
#define pi acos(-1)
#define endl '\n'
#define fin freopen("input", "r", stdin)
#define Fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
//
int main() {
    ll n;
    cin >> n;
    ll ar[n];

    map<ll, ll> mp;
    for (ll i = 0; i < n; i++) {
        cin >> ar[i];
        auto it = mp.find(ar[i]);
        if (it == mp.end()) mp.insert({ar[i], 1});
        else it->second += 1;
    }

    for (auto it = mp.begin(); it != mp.end(); it++) {
        if (it->second != 3) cout << it->first << " ";
    }
}