#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define int long long
#define double long double
#define endl '\n'
#define sz size
#define pb push_back
#define fs first
#define sc second
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
int const INF = LONG_LONG_MAX;

int n;

void solve()
{
    ifstream cin("scmax.in");
    ofstream cout("scmax.out");
    cin>>n;
    vector<int> dp;
    for(int i=1;i<=n;i++)
    {
        int x;
        cin>>x;
        auto it=lower_bound(all(dp), x);
        if(it==dp.end()){dp.pb(x);}
        else{*it=x;}
    }
    cout<<dp.sz()<<endl;
    for(int x:dp)
        cout<<x<<' ';
}

int32_t main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int tc=1;
    //cin>>tc;
    while(tc--)
    {
        solve();
    }
    return 0;
}