#include <bits/stdc++.h>

using namespace std;

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

const int NMAX =  100000;

int n;
int v[NMAX+1], len;
int dp[NMAX+1];
int pos[NMAX+1];
vector <int> ans;

int main()
{
    fin >> n;
    for(int i=1; i<=n; i++)
    {
        fin >> v[i];
        if(v[i] > dp[len])
            dp[++len] = v[i], pos[i] = len;
        else
        {
            int ind = lower_bound(dp+1,dp+1+len,v[i])-dp;
            dp[ind] = v[i];
            pos[i] = ind;
        }
    }
    fout << len << '\n';
    for(int i=n; i>=1; i--)
    {
        if(pos[i] == len)
        {
            ans.push_back(v[i]);
            len--;
        }
    }
    int sz = ans.size();
    for(int i=sz-1; i>=0; i--)
        fout << ans[i] << ' ';
    return 0;
}