#include <cstdio>
#define MAX 5000
#define INF -1000001
using namespace std;
int v[MAX+1], best[MAX+1], last[MAX+1], vc[MAX+1];
void afisare(int x)
{
    printf("%d ", x);
    if(last[x]!=0)
        afisare(last[x]);
}
int main()
{
    freopen("subsir2.in", "r",stdin);
    freopen("subsir2.out", "w", stdout);
    int i, m, n, pozmax, min;
    scanf("%d", &n);
    for(i=1;i<=n;i++)
        scanf("%d", &v[i]);
    best[n]=1;
    v[0]=INF;
    for(i=n-1;i>=0;i--)
    {
        m=n+1;
        pozmax=0;
        min=1000001;
        for(int j=i+1;j<=n;j++)
        {
            if(v[i]<v[j])
                vc[j]=1;
            if(v[i]<v[j]&&v[j]<min)
                min=v[j];
            if(v[i]<v[j]&&v[j]<=min)
            {
                if(best[j]+1<=m){
                    m=best[j]+1;
                    pozmax=j;
                }
            }
        }
        if(m==n+1)
            m=1;
        best[i]=m;
        last[i]=pozmax;
    }
    printf("%d\n", best[0]-1);
    afisare(last[0]);
    return 0;
}