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

typedef long long ll;
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define pi pair<ll, ll>
#define sz(x) (int)((x).size())
#define all(a) (a).begin(), (a).end()

/*const ll maxn = 1e5;
int f[maxn],nf[maxn],inv[maxn];
const int M=998244353;
void init(){
    inv[1]=1; for (int i=2;i<maxn;i++) inv[i]=M-1ll*(M/i)*inv[M%i]%M;
    f[0]=nf[0]=1; for (int i=1;i<maxn;i++) f[i]=1ll*f[i-1]*i%M,nf[i]=1ll*nf[i-1]*inv[i]%M;
}
int C(int x,int y){return 1ll*f[x]*nf[y]%M*nf[x-y]%M;} */

const ll mod = 1e9+7;
ll n, k, m, mi, ma;

void solve(){
	
	ifstream cin("scmax.out");
	ofstream cout("scmax.out");
	cin >> n;
	vector<ll> L(n + 500, -1), b(n + 500, -1), a(n + 500), ans(n);
	for(int i = 0; i<n; i++){
		cin >> a[i];
	}
	ll w = 1;
	L[1] = 0;
	ans[0] = 1;
	b[0] = -1;
	for(int i = 1; i<n; i++){
		
		ll l = 1, r = w;
		ma = 0;
		while(l <= r){
			ll x = (l + r)/2;
			if(a[L[x]] >= a[i]){
				r = x - 1;
				continue;
			}
			l = x + 1;
			ma = max(ma, x);
		}
		ans[i] = ma + 1;
		b[i] = L[ma];
		if(w == ma) w++;
		if(L[ma + 1] == -1){
			L[ma + 1] = i;
			continue;
		} 
		if(a[L[ma + 1]] > a[i]) L[ma + 1] = i;
	}
	ma = 0;
	for(int i = 0; i<n; i++){
		if(ans[ma] > ans[i]) continue;
		ma = i;
	}
	vector<ll> c;
	while(ma != -1){
		c.pb(ma);
		ma = b[ma];
	}
	reverse(all(c));
	cout << c.size() << "\n";
	for(int i = 0; i<c.size(); i++) cout << a[c[i]] << " "; cout << "\n";
	//cout << w << "\n";
//	for(int i = 0; i<n; i++) cout << ans[i] << " "; cout << "\n";
}

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

	//init();
	
	int t=1;
//	cin >> t;
	while(t--) solve();
	
	return 0;
}