#include <bits/stdc++.h>
using namespace std;

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

/**
24 12 15 15 19
12 15 15 19
*/

int n, a[100002], sol[100002], top;

int CB(int x)
{
    int st, dr, mij, pos;
    st = 1; dr = top; pos = -1;
    while(st <= dr)
    {
        mij = (st + dr) / 2;
        if(sol[mij] > x)
        {
            pos = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }
    return pos;
}

int main()
{
    int i;
    fin >> n;
    for(i = 1; i <= n; i++)
        fin >> a[i];
    for(i = 1; i <= n; i++)
    {
        if(a[i] < sol[1])
            sol[1] = a[i];
        if(a[i] > sol[top])
            sol[++top] = a[i];
        else sol[CB(a[i])] = a[i];
    }
    fout << top << "\n";
    for(i = 1; i <= top; i++)
        fout << sol[i] << " ";
    return 0;
}