#include <bits/stdc++.h>

#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pic pair<int, char>
#define pis pair<int, string>
#define pcc pair<char, char>
#define pci pair<char, int>
#define psi pair<string, int>
#define pdd pair<double, double>
#define pli pair<ll, int>
#define mp make_pair
#define rangeAll(a) a.begin(), a.end()
#define RETWR cout << "NO"; return 0;

const ll MOD = 1000000007;
const int INF = 1 << 30;

using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    #endif
    multiset<int> ms;
    for (int i = 0; i < 10; ++i) {
        ms.insert(rand());
    }
    int z = 0;
    for (auto it = ms.begin(); it != ms.end(); ) {
        if (z & 1) {
            auto del = it;
            it++;
            ms.erase(del);
        }
        else {
            cout << *it << ' ';
            it++;
        }
        z++;
    }
    cout << endl;
    return 0;
}