#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
using namespace std;
#define all(a) a.begin(), a.end()
typedef long double ld;
const int inf = 1e9;
struct Segtree {
    struct node {
        int val, ind;
        node() {
            val = inf, ind = -1;
        }
    };
    vector<node> t;
    int n;
    Segtree(int _n) :n(_n) {
        t.resize(4 * n, node());
    }
    node cmin(const node& lhs, const node& rhs) {
        if (lhs.val > rhs.val) return rhs;
        return lhs;
    }
    void update(int v, int tl, int tr, int pos, int x) {
        if (tl == tr) {
            t[v].val = x;
            t[v].ind = pos;
            return;
        }
        int tm = (tl + tr) / 2;
        if (pos <= tm) { update(v * 2, tl, tm, pos, x); }
        else { update(v * 2 + 1, tm + 1, tr, pos, x); }
        t[v] = cmin(t[v * 2], t[v * 2 + 1]);
    }
    node get_min(int v, int tl, int tr, int l, int r) {
        if (tl > r || tr < l) { return node(); }
        if (tl >= l && tr <= r) { return t[v]; }
        int tm = (tl + tr) / 2;
        return cmin(get_min(v * 2, tl, tm, l, r), get_min(v * 2 + 1, tm + 1, tr, l, r));
    }
};
int n;
struct w_edge {
    int val1, val2;
    w_edge(int _v1, int _v2) :val1(_v1), val2(_v2) {};
};

vector<vector<pair<int, w_edge>>> gr;
int count_vertex = 0;
void merge(int l, int r, Segtree& odd_t, Segtree& ev_t, int pred) {
    if (r <= l)return;
    if (l % 2 == 1) {
        Segtree::node i = odd_t.get_min(1, 0, n - 1, l, r);
        Segtree::node j = ev_t.get_min(1, 0, n - 1, i.ind, r);
        gr[pred].push_back({ count_vertex++, w_edge(i.val, j.val) });
        odd_t.update(1, 0, n - 1, i.ind, inf);
        ev_t.update(1, 0, n - 1, j.ind, inf);
        int now = count_vertex - 1;
        if (l < i.ind - 1) { merge(l, i.ind - 1, odd_t, ev_t, now); }
        merge(i.ind + 1, j.ind - 1, odd_t, ev_t, now);
        if (j.ind + 1 < r) { merge(j.ind + 1, r, odd_t, ev_t, now); }
    }
    else {
        Segtree::node i = ev_t.get_min(1, 0, n - 1, l, r);
        Segtree::node j = odd_t.get_min(1, 0, n - 1, i.ind, r);
        gr[pred].push_back({ count_vertex++, w_edge(i.val, j.val) });
        ev_t.update(1, 0, n - 1, i.ind, inf);
        odd_t.update(1, 0, n - 1, j.ind, inf);
        int now = count_vertex - 1;
        if (l < i.ind - 1) { merge(l, i.ind - 1, odd_t, ev_t, now); }
        merge(i.ind + 1, j.ind - 1, odd_t, ev_t, now);
        if (j.ind + 1 < r) { merge(j.ind + 1, r, odd_t, ev_t, now); }
    }
}

signed main() {
#ifdef _DEBUG
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cin >> n;
    int k; cin >> k;
    Segtree odd_t(n), ev_t(n);
    gr.resize(n);
    for (int i = 0; i < n; i++) {
        int x; cin >> x;
        if (i % 2 == 0) {
            ev_t.update(1, 0, n - 1, i, x);
            odd_t.update(1, 0, n - 1, i, inf);
        }
        else {
            ev_t.update(1, 0, n - 1, i, inf);
            odd_t.update(1, 0, n - 1, i, x);
        }
    }
    {
        Segtree::node i = ev_t.get_min(1, 0, n - 1, 0, n - 1);
        Segtree::node j = odd_t.get_min(1, 0, n - 1, i.ind, n - 1);
        gr[count_vertex].push_back({ count_vertex + 1, w_edge(i.val, j.val) });
        count_vertex += 2;
        ev_t.update(1, 0, n - 1, i.ind, inf);
        odd_t.update(1, 0, n - 1, j.ind, inf);
        if (0 < i.ind - 1) { merge(0, i.ind - 1, odd_t, ev_t, 1); }
        merge(i.ind + 1, j.ind - 1, odd_t, ev_t, 1);
        if (j.ind + 1 < n - 1) { merge(j.ind + 1, n - 1, odd_t, ev_t, 1); }
    }
    set <pair<int, pair<int, int>>> q;
    q.insert({ -1,{-1, 0} });
    while (!q.empty()) {
        auto f = *q.begin();
        if (f.first != -1) {
            if (k) {
                cout << f.first << ' ';
                k--;
            }
            if (k) {
                cout << f.second.first << ' ';
                k--;
            }
            if (k == 0) {
                break;
            }
        }
        q.erase(q.begin());
        for (pair<int, w_edge>& u : gr[f.second.second]) {
            q.insert({ u.second.val1,{u.second.val2, u.first} });
        }
    }
}