#include <cstdio>
int sir[5005],v[5005];
int main () {
	int n,i,j,minl,p;
	freopen("subsir2.in","r",stdin);
	freopen("subsir2.out","w",stdout);
	scanf("%d",&n);
	for(i=1;i<=n;++i)scanf("%d",&sir[i]);
	for(i=1;i<=n;++i){
		for(j=0;j<i;++j){
			if(sir[i]>sir[j]&&v[i]<=v[j])v[i]=v[j]+1;
		}
	}
	printf("%d\n",v[n]);
	for(j=1;j<=v[n];++j){
		minl=99999999;
		for(i=1;i<=n;++i)if(v[i]==j&&minl>sir[i]){
			minl=sir[i];
			p=i;
		}
		printf("%d ",p);
	}
	return 0;
}