#include <iostream>
#include <fstream>
#define MAX 1001
using namespace std;
ifstream f("sclm.in");
ofstream g("sclm.out");
int a[MAX],b[MAX],poz[MAX];
int caut(int p,int u,int x)
{
    int m;
    while (p<=u)
    {
        m=p+(u-p)/2;
        if(x<a[b[m]])
            p=m+1;
        else u=m-1;
    }
    return p;
}
int main()
{
    int i,j,k,n,m=0,lmax=0;
    f>>n;
    for(i=1;i<=n;i++)
        f>>a[i];
    a[0]=1234567890;
    for(i=n;i>=1;i--)
    {
        poz[i]=0;
        k=caut(1,m,a[i]);
        if(k>m)
        {
            poz[i]=b[k-1];
            m=k;
            b[k]=i;
        }
        else
        {
             poz[i]=b[k-1];
             if(a[b[k]]<a[i]) b[k]=i;
        }
        lmax+=k-1;

    }

    g<<m<<'\n';
    for(i=b[m];i>0;i=poz[i])
        g<<i<<" ";
    return 0;
}