#include <iostream>
#include <fstream>
#define NMAX 100000

using namespace std;

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

int n, k, v[NMAX+10], dp[NMAX+10];

int binSearch(int val)
{   int st = 1, dr = k, ans = 1;
    while(st <= dr)
        {   int mij = (st + dr) / 2;
            if(dp[mij] >= val) ans = mij, dr = mij - 1;
            else st = mij + 1;
        }
    return ans;
}

int main()
{
    f >> n;
    for(int i=1; i<=n; i++) f >> v[i];
    k = 0;
    for(int i=1; i<=n; i++)
        {   if(v[i] > dp[k]) k++, dp[k] = v[i];
            else
                {   int poz = binSearch(v[i]);
                    dp[poz] = v[i];
                }
        }
    g << k << '\n';
    for(int i=1; i<=k; i++) g << dp[i] << ' ';
    g << '\n';
    return 0;
}