#include<fstream>
using namespace std;
ifstream F("subsir2.in");
ofstream G("subsir2.out");
int n,i,a[5001],l[5001],p[5001],m,j,r[5001];
int main()
{
    for(F>>n,i=1;i<=n;F>>a[i++]);
    for(l[n]=1,i=n-1;i;l[i]=l[i]==1e9?1:l[i],--i)
        for(m=1e9,l[i]=1e9,j=i+1;j<=n;++j)
            if(a[j]>=a[i]&&a[j]<m)
                if(m=a[j],l[i]>l[j]+1)
                    l[i]=l[j]+1,p[i]=j;
                else if(l[i]==l[j]+1&&p[i]&&a[p[i]]>a[j])
                    p[i]=j;
    for(i=1;i<=n;++r[p[i++]]);
    for(j=1,i=2;i<=n;++i)
        if(!r[i]&&l[i]<=l[j]&&a[i]<a[j])
            j=i;
    for(G<<l[j]<<'\n';j;G<<j<<' ',j=p[j]);
    return 0;
}