#include<bits/stdc++.h> //:3
using namespace std;
typedef long long LL;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pi pair<int, int>
#define sz(x) (int)((x).size())
#define int long long
#define cin in
#define cout out

const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};

const LL inf = 2e6;
const LL mod = 1e9 + 7;
const int N = 2e6 + 11;
const LL INF64 = 3e18 + 1;
const double eps = 1e-14;
const double PI = acos(-1);

int n, a[N], dp[N], ind[N], p[N];

ifstream in("scmax.in");
ofstream out("scmax.out");

void solve(){

    cin >> n;

    for(int i = 1; i <= n; i++)dp[i] = INF64;

    int ans = 0;

    for(int i = 1; i <= n; i++){
        cin >> a[i];

        int x = lower_bound(dp + 1, dp + n + 1, a[i]) - dp;

        p[i] = ind[x - 1];
        ind[x] = i;
        dp[x] = a[i];

        ans = max(ans, x);
    }

    cout << ans << '\n';

    vector<int> v;

    int lst = ind[ans];
    while(lst != 0){
        v.pb(a[lst]);
        lst = p[lst];
    }

    reverse(all(v));
    for(auto it : v)cout << it << ' '; cout << '\n';
}

int32_t main(){
ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);

    //cout << setprecision(6) << fixed;

    int T = 1;
    //cin >> T;
    while(T--){
        solve();
    }
}