#include<fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, A[1001], D[1001], P[1001], I[1001], k;
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>A[i];
    k = 1;
    D[k] = A[1];
    P[1] = 1;
    for(int i = 2 ; i <= n ; i ++)
    {
        if(A[i] > D[k])
            D[++k] = A[i], P[i] = k;
        else
        {
            int st = 1 , dr = k , p = k + 1;
            while(st <= dr)
            {
                int m = (st + dr) / 2;
                if(D[m] > A[i])
                    p = m, dr = m - 1;
                else
                    st = m + 1;
            }
            D[p] = A[i];
            P[i] = p;
        }
    }
    fout<<k<<endl;
    int j = n;
    for(int i = k ; i >= 1 ; i --)
    {
        while(P[j] != i)
            j --;
        I[i] = j;
    }
    for(int i=1;i<=k;i++)
    {
        fout<<A[I[i]]<<' ';
    }
    return 0;
}