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#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=-1*INF;
for(int j=i+1;j<=n;j++)
{
if(v[i]<=v[j]&&v[j]<min)
{
if(v[j]<min)
min=v[j];
if(m==best[j]+1&&v[j]<v[pozmax])
pozmax=j;
if(m>best[j]+1)
{
pozmax=j;
m=best[j]+1;
}
}
}
if(m==n+1)
m=1;
best[i]=m;
last[i]=pozmax;
}
printf("%d\n", best[0]-1);
afisare(last[0]);
return 0;
}