#include <cstdio>

using namespace std;

int x[10002],y[10002],z[10002],u[10002],v;

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

    int n,max=y[1],k;

    fscanf(f,"%d",&n);
    for(int i=1;i<=n;++i)
        fscanf(f,"%d",&x[i]);

    for(int i=1;i<=n;++i)
    {
        y[i]=1;
        for(int j=1;j<i;++j)
            if(x[i]>x[j])
                if(y[i]<y[j]+1)
                {
                    y[i]=y[j]+1;
                    z[i]=j;
                }
    }
    for(int i=1;i<=n;++i)
        if(y[i]>max)
        {
            max=y[i];
            k=i;
        }
    fprintf(g,"%d\n",max);
    do
    {
        ++v;
        u[v]=x[k];
        k=z[k];
    }while(k!=0);
    for(int i=v;i>=1;--i)
        fprintf(g,"%d ",u[i]);
    fclose(f);
    fclose(g);
    return 0;
}