#include <cstdio>
#include <vector>
using namespace std;
#define N 10001

int n,k=0;
vector <int> A[N];

FILE *f = fopen("scmax.in","r");
FILE *g = fopen("scmax.out","w");

int cb(int x)
{
    int r = 0, pas = 1<<20;
    while(pas)
    {
        if(r+pas <= k)
            {
                if(A[r+pas][A[r+pas].size()-1]>x)
                r += pas;
                else if(A[r+pas][A[r+pas].size()-1]==x)
                    return -1;
            }
        pas/=2;
    }
    return r+1;
}

int main()
{
    int i,maxim=0,rasp;
    int x;
    fscanf(f,"%d",&n);
    for(i=1; i<=n; i++)
    {
        fscanf(f,"%d",&x);
        int y=cb(x);
        if(y>k)
            k++;
        if(y!=-1)
        {
        A[y].push_back(x);
        if(A[y].size()>maxim)
        {
            maxim=A[y].size();
            rasp=y;
        }
        }
    }
    fprintf(g,"%d\n",maxim);
    for(i=0;i<A[rasp].size();i++)
        fprintf(g,"%d ",A[rasp][i]);
    return 0;
}