#include<iostream>
using namespace std;
#include<stdio.h>
FILE *f,*g;
long n,i,j,maxim,l[100003],maximfinal,memorare[100003],m=1,p;
long long a[100003];
int main()
{
    f=fopen("subsir2.in","r");
    g=fopen("subsir2.out","w");
    fscanf(f,"%ld",&n);
    for(i=1;i<=n;i++)
        fscanf(f,"%lld",&a[i]);
    l[n]=1;
    for(i=n-1;i>=1;i--)
    {
        maxim=0;
        for(j=i+1;j<=n;j++)
            if(a[i]<a[j]&&l[j]>maxim)
            {maxim=l[j];
            }
        l[i]=maxim+1;
        if(l[i]>maximfinal)
            maximfinal=l[i];
    }
    fprintf(g,"%ld\n",maximfinal);
    for(i=1;i<=n;i++)
    {
        if(l[i]==maximfinal)
            {fprintf(g,"%lld ",a[i]);
        maximfinal--;}
    }

}