#include<stdio.h>
#include<stdlib.h>
#include<limits.h>
#define NMAX 5000
#define MMAX 60000

int n,a[NMAX+1];
int m[NMAX+1],M[NMAX+1],nextm[NMAX+1],l[NMAX+1],nextM[NMAX+1];


int main(){
freopen("subsir2.in","r",stdin);
freopen("subsir2.out","w",stdout);
int i,j,lmin,lmax,first,ua,max,min,pmin,pmax,sol[NMAX+1],k,t;
char sir[MMAX],*p;
scanf("%d\n",&n);
//for(i=1;i<=n;++i) scanf("%d",&a[i]);
fgets(sir,MMAX,stdin);p=sir;
for(i=1;i<=n;++i){
	a[i]=atoi(p);
	while(*p!=32) ++p;
	++p;
	}
min=max=a[1];pmin=pmax=1;
for(i=2;i<=n;++i){
	if(a[i]<min) min=a[i],pmin=i;
	if(a[i]>=max) max=a[i],pmax=i;
	}

if(min==max) {
	lmin=n;first=1;
	for(i=1;i<=n;++i) sol[i-1]=i;
	goto finish;
	}
if(pmin==n) {lmin=1;sol[0]=n; goto finish;}
if(pmax==1) {lmin=1;sol[0]=1; goto finish;}

int ales;
M[n]=1;
for(i=n-1;i;--i){
	lmin=0;ua=a[i];ales=0;
	for(j=i+1;j<=n;++j)
		if(a[i]<=a[j]){
			if(!ales){
				lmin=M[j];nextM[i]=j;
				ua=a[j];
				ales=1;
				}
			else
				if(ua>a[j])
					if(lmin>M[j]){
						lmin=M[j];nextM[i]=j;
						ua=a[j];
						}
				/*	else      ////
						if(lmin==M[j]&&a[j]<ua){
							nextM[i]=j;
							ua=a[j];
							}      */
				}
	M[i]=lmin+1;
	}
m[1]=1;
for(i=2;i<=n;++i){
	lmin=0;ua=a[i];ales=0;
	for(j=i-1;j;--j)
		if(a[j]<=a[i]){
			if(!ales){
				lmin=m[j];nextm[i]=j;
				ua=a[j];
				ales=1;
				}
			else
				if(ua<a[j])
					if(lmin>m[j]){
						lmin=m[j];nextm[i]=j;
						ua=a[j];
						}
					else
						if(lmin==m[j]&&a[j]>ua){
							nextm[i]=j;
							ua=a[j];
							}
				}
	m[i]=lmin+1;
	}
for(i=1;i<=n;++i) l[i]=m[i]+M[i]-1;
lmin=n;
for(i=1;i<=n;++i)
	if(lmin>l[i]) {lmin=l[i];first=i;}
	else if(lmin==l[i]&&a[first]>a[i])
			first=i;
i=first;k=0;sol[0]=first;k++;

while(nextM[i]){
	sol[k++]=nextM[i];
	i=nextM[i];
	}
finish:
printf("%d\n",lmin);
for(i=0;i<lmin;++i)
	printf("%d ",sol[i]);
return 0;
}