/*
Problem:cogs2092;
Language:c++;
by dydxh;
2015.11.04;
*/
#include<iostream>
#include<cstdio>
#include<set>
#include<map>
#include<queue>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<utility>
#include<ctime>
#include<cstdlib>
#include<bitset>
#include<string>
#define ll long long
#define ull unsigned long long
using namespace std;
const int oo=2000000000;
const int maxn=1005;
int n,ans;
bitset<1005> A[70],Rel[70];
bool used[maxn];
ll a[maxn];
inline ll read(){
	ll x=0;bool flag=0;char ch=getchar();
	while(ch>'9' || ch<'0') {if(ch=='-') flag=1;ch=getchar();}
	while(ch>='0' && ch<='9') {x=x*10+ch-'0';ch=getchar();}
	return flag?-x:x;
}
bool Gauss(int x){
	memcpy(A,Rel,sizeof(A));
	for(int j=1;j<=63;j++)
		if(A[j][x]){
			A[j][x]=false;
			if(A[j][n+1]==true) A[j][n+1]=false;
			else A[j][n+1]=true;
		}
	for(int j=1;j<=63;j++){
		int i=1;
		while(i<=n && A[j][i]==false) i++;
		if(i>n && A[j][n+1]==true) return false;
		else if(i<=n)
			for(int k=j+1;k<=63;k++)
				if(A[k][i]==true)
					A[k]^=A[j];
	}
	return true;
}
int main()
{
	//freopen("cc.in","r",stdin);
	freopen("asm_contribute.in","r",stdin);
	freopen("asm_contribute.out","w",stdout);
	n=read();
	for(int i=1;i<=n;i++) a[i]=read();
	for(int i=1;i<=n;i++)
		for(int j=1;j<=63;j++){
			if((a[i]&(1LL<<(j-1))))
				Rel[j][i]=true;
			else Rel[j][i]=false;
		}
	for(int i=1;i<=63;i++) Rel[i][n+1]=false;
	for(int i=1;i<=n;i++)
		if(Gauss(i)){
			used[i]=true;
			ans++;
			for(int j=1;j<=63;j++)
				if(Rel[j][i]){
					Rel[j][i]=false;
					if(Rel[j][n+1]==true) Rel[j][n+1]=false;
					else Rel[j][n+1]=true;
				}
		}
	printf("%d\n",ans);
	for(int i=1;i<=n;i++)
		if(used[i])
			printf("%d ",i);
	printf("\n");
	return 0;
}