#include <bits/stdc++.h>

using namespace std;

int n;
int dp[100000];
int v[100000], len[100000];

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

int main()
{
    in >> n;
    for(int i = 1; i <= n; i ++){
        in >> v[i];
    }

    int dpPos = 1;

    dp[1] = v[1];

    for(int i = 1; i <= n; i ++){
            int l = 0,r = dpPos;
            while(l <= r){
                int mij = (l + r) / 2;
                if(v[i] > dp[mij]){
                    l = mij + 1;
                }
                else{
                    r = mij - 1;
                }
            }
            if(l == dpPos + 1)
                dpPos ++;
            dp[l] = v[i];
            len[i] = l;
    }

    out << dpPos << endl;
    for(int i = 1; i <= dpPos; i ++){
        out << dp[i] << " ";
    }
    return 0;
}