#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<(n);++i)
#define ALL(x) x.begin(),x.end()
#define BACK(x) x.rbegin(),x.rend()
#define MOD1 1000000007
#define MOD2 998244353
#define MOD1_BASE 131
#define INF (LLONG_MAX / 2)
#define FLOAT_ANS setprecision(30)
#define TORAD(x) (x*acos(-1)/180.0)
#define TODEG(x) (x*180/acos(-1))
#define GET_VALUENAME(value) # value

using namespace std;
using ll = long long;
using LL = __int128_t;
using ull = unsigned long long;

template<typename T> // T:重み
using p_que = priority_queue<T,vector<T>,greater<T>>;

template<typename T>
bool chmin(T& a,T b){if(a>b){a=b;return true;}return false;}

template<typename T>
bool chmax(T& a,T b){if(a<b){a=b;return true;}return false;}

ll modpow(ll a, ll n, ll mod) {ll res=1;while (n>0) {if(n&1)res=(res*(a%mod))%mod;a=((a%mod)*(a%mod))%mod;n>>=1;}return res;}

template<typename T>
void RotateVec2(vector<vector<T>>&v){ll h=v.size();ll w=v[0].size();vector<vector<T>>t(w,vector<T>(h));rep(i,h){rep(j,w){t[j][h-i-1]=v[i][j];}}v=t;}

template<class T>
bool InRange(T x, T mn, T mx){return (mn <= x && x <= mx);}

template<typename T>
vector<T>&merged(vector<T>&a,vector<T>&b) {vector<T>res;merge(a.begin(),a.end(),b.begin(),b.end(),back_inserter(res));return res;}

struct UnionFind{
    vector<ll>tree;
    UnionFind(ll x):tree(x, -1){}
    ll root(ll x){if(tree[x]<0) return x;return tree[x]=root(tree[x]);}
    bool same(ll x,ll y){return root(x)==root(y);}
    ll size(ll x){return -tree[root(x)];}
    void unite(ll x,ll y){x=root(x),y=root(y);if(x==y)return;if(size(x)<size(y))swap(x,y);tree[x]+=tree[y];tree[y]=x;}
};

template<class T>
struct SegTree{
    ll n;T e;vector<T>tree,lazy;function<T(T,T)>f,add;
    SegTree(ll n_,function<T(T,T)>f_,T e_=0,function<T(T,T)>add_=[](T next,T old){return next;}):e(e_),f(f_),add(add_){
        ll x=1;
        while(x<n_)x*=2;
        n=x;
        tree.assign(n*2,e);
        lazy.assign(n*2,e);
    }
    void eval(T k) {
        if (lazy[k] == e) return;
        if (k < n-1){
            lazy[k*2+1]=lazy[k*2+1]=lazy[k];
        }
        tree[k]=lazy[k], lazy[k]=e;
    }
    void update(ll idx,T x){
        update(idx, idx+1, x);
    }
    void update(ll a, ll b, ll x) { update(a, b, x, 0, n, 0); }
    void update(ll a, ll b, ll x, ll l, ll r, ll k) {
        eval(k);
        if (a <= l and r <= b) {
            lazy[k] = x;
            eval(k);
        }
        else if (a < r and l < b) {
            update(a, b, x, l, (l+r)/2, k*2+1);
            update(a, b, x, (l+r)/2, r, k*2+1);
            tree[k] = f(tree[k*2+1], tree[k*2+2]);
        }
    }
    T query(ll x,ll y){
        return query_sub(x,y,0,n,0);
    }
    T query_sub(ll x,ll y,ll l,ll r,ll k){
        eval(k);
        if(r<=x||y<=l)return e;
        if(x<=l&&r<=y)return tree[k];
        T c1=query_sub(x,y,l,(l+r)/2,k*2+1);
        T c2=query_sub(x,y,(l+r)/2,r,k*2+2);
        return f(c1,c2);
    }
    T get(ll idx){return tree[idx+n-1];}
};

template<std::uint_fast64_t Modulus> class modint {
    using u64 = std::uint_fast64_t;
public:
    u64 a;
    constexpr modint(const u64 x = 0) noexcept : a(((x % Modulus)+Modulus)%Modulus) {}
    constexpr u64 &value() noexcept { return a; }
    constexpr const u64 &value() const noexcept { return a; }
    constexpr modint operator+(const modint rhs) const noexcept {return modint(*this) += rhs;}
    constexpr modint operator-(const modint rhs) const noexcept {return modint(*this) -= rhs;}
    constexpr modint operator*(const modint rhs) const noexcept {return modint(*this) *= rhs;}
    constexpr modint operator/(const modint rhs) const noexcept {return modint(*this) /= rhs;}
    constexpr modint &operator+=(const modint rhs) noexcept {a += rhs.a;if (a >= Modulus) {a -= Modulus;}return *this;}
    constexpr modint &operator-=(const modint rhs) noexcept {if (a < rhs.a) {a += Modulus;}a -= rhs.a;return *this;}
    constexpr modint &operator*=(const modint rhs) noexcept {a = a * rhs.a % Modulus;return *this;}
    constexpr modint &operator/=(modint rhs) noexcept {
        u64 exp = Modulus - 2;
        while (exp) {
            if (exp % 2) {
                *this *= rhs;
            }
            rhs *= rhs;
            exp /= 2;
        }
        return *this;
    }
    constexpr modint &operator=(u64 x){ a = x % Modulus; return *this; }
};

template<class T=ll>
struct Vector2D {
    T x, y;
    Vector2D():x(0),y(0) {}
    Vector2D(T x_, T y_):x(x_),y(y_) {}

    double length() const { return sqrt((double)x*x+y*y); };
    T lengthp() const { return x*x+y*y; };
    bool inrange(const Vector2D a, const Vector2D b) { return (InRange(x, a.x, b.x) and InRange(y, a.y, b.y)); }
    Vector2D yx() { return Vector2D{ y, x }; }
    Vector2D operator-(const Vector2D a) const { return Vector2D(*this) -= a; }
    Vector2D operator+(const Vector2D a) const { return Vector2D(*this) += a; }
    T operator*(const Vector2D a) const { return x*a.x+y*a.y; }
    Vector2D operator*(const T a) const { return Vector2D(*this) *= a; }
    Vector2D operator/(const T a) const { return Vector2D(*this) /= a; }
    Vector2D &operator+=(const Vector2D a) { x += a.x; y += a.y; return *this; }
    Vector2D &operator-=(const Vector2D a) { x -= a.x; y -= a.y; return *this; }
    Vector2D &operator-=(const T a) { x -= a; y -= a; return *this; }
    Vector2D &operator*=(const T a) { x *= a; y *= a; return *this; }
    Vector2D &operator/=(const T a) { x /= a; y /= a; return *this; }
    friend ostream& operator<< (ostream& stream, const Vector2D<>& x);
    bool operator==(const Vector2D a) const { return (x==a.x and y==a.y); }
    bool operator!=(const Vector2D a) const { return not (x==a.x and y==a.y); }
    bool operator>(const Vector2D a) const { return a < *this; }
    bool operator<(const Vector2D a) const 
    {
        return make_pair(x,y) < make_pair(a.x, a.y);
        // return x*a.y < y*a.x;
    }
};

ostream& operator<< (ostream& stream, const Vector2D<ll>& x) {
    string s = "(" + to_string(x.x) + ", " + to_string(x.y) + ")";
    stream << s;
    return stream;
}

ll popcount(ll x) { ll res = 0; while(x) {res+=x%2;x>>=1;} return res; }

// debug kit
void print() { cout << endl; }
template<class T>
void print_(vector<T>x) { for(auto i : x) cout << i << " "; }
template<class T>
void print_(T x) { cout << x << " "; }
#ifdef ONLINE_JUDGE 
template<class T, class ...Args>
void print(T head, Args... args) {}
template<class T>
void debug(T value) {}
#else
template<class T, class ...Args>
void print(T head, Args... args) { print_(head); print(args...); }
template<class T>
void debug(T value) { print((string)"\""+GET_VALUENAME(value)+"\": ", value); }
#endif

// MAIN PROGRAM ------------

using mint = modint<MOD2>;
using Vec2 = Vector2D<ll>;
const Vec2 Angle[] = {{0,1}, {0,-1}, {-1,0}, {1,0}};

struct Node
{
    ll prev, next, value;
    bool valid = true;
};

int main() {
    ll n;
    cin >> n;
    vector<Node>p(n+2);
    vector<ll>inv(n);
    rep(i, n) {
        cin >> p[i].value;
        --p[i].value;
        p[i].next = i+1;
        p[i].prev = i-1;
        inv[p[i].value] = i;
    }
    p[0].prev = n+1;

    vector<ll>q;

    function<ll(ll)>getNext = [&](ll i)
    {
        ll next = p[i].next;
        if (p[next].valid) return next;
        return p[i].next = getNext(p[i].next);
    };
    function<ll(ll)>getPrev = [&](ll i)
    {
        ll prev = p[i].prev;
        if (p[prev].valid) return prev;
        return p[i].prev = getPrev(p[i].prev);
    };

    // for (auto i : p) cout << i.value << " ";

    rep(i, n) {
        ll idx = inv[i];
        if (not p[inv[i]].valid) continue;
        if (getNext(idx) == n) continue;
        // cout << i + 1 << " " << inv[i] << endl;
        Node &x = p[idx], &y = p[getNext(idx)];
        Node &prev = p[getPrev(idx)], &next = p[getNext(getNext(idx))];

        x.valid = y.valid = false;
        q.push_back(x.value+1);
        q.push_back(y.value+1);

        prev.next = y.next;
        next.prev = x.prev;

    }
    for (auto i : q) cout << i << " ";
    cout << endl;

}