#include <iostream>
#include <algorithm> // for sort, mainly
#include <vector>
#include <map>
#include <set>
#include <cmath>
#include <array>
#include <string>
#include <cstdio>
#include <iterator>
#include <unordered_set>
#include <cstdint> // for int64_t, int32_t, etc
#include <queue>
#include <stack>
#include <deque>
#include <numeric> // gcd, lcm
#include <fstream>
#include <bitset> // for bitset
#include <iomanip>
#include <cassert> // for set with custom ordering
#include <type_traits> // for set with custom ordering
#include <utility> // for swap, forward, etc
using namespace std;

#pragma GCC optimize("O2")
// #pragma GCC optimize("O1","O2","O3","Ofast","unroll-loops")
// #pragma GCC target("sse","sse2","sse3","sse4.1","sse4.2","avx","avx2","fma")

template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << '}'; }
void dbg_out() { cout << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cout << ' ' << H; dbg_out(T...); }
#ifdef LOCAL
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

/*

notes:

int64_t
stoi(string s) -> string to int
to_string() -> int (or else) to string

vector declaration:
vector<ll> v(n, 0)
vector<vector<ll>> v(n, vector<ll>(n, 0));

{if statement} ? {truth value} : {false value}

#ifdef LOCAL
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
#endif

std::lcm(ll a, ll b), std::gcd(int a, int b)

cout << fixed << setprecision(n);

set with custom ordering
set<ll, decltype(&cmp)> qu(cmp);

*/

typedef int64_t ll;

vector<ll> to;

ll dfs(ll i, vector<bool> &vis) {

	vis[i] = true;

	if(vis[to[i]] == false) {
		return 1 + dfs(to[i], vis);
	}else{
		return 0;
	}

}
 
void solve() {

	ll n;
	cin >> n;
	to.resize(n+1, 0);
	vector<ll> ind(n+1, 0);
	for(ll i = 1; i <= n; i++) {
		cin >> to[i];
		ind[to[i]]++;
	}

	// v[i] <- kinek akar az i-edik sugni
	// i legyen v[i] mellett

	/*

	1 2 3 4 5 6 7 8
	3 1 4 1 1 7 8 6

	ez effektive egy graf

	*/

	vector<pair<ll,ll>> d(n, {0,0});

	for(ll i = 1; i <= n; i++) {

		vector<bool> vis(n+1, false);
		d[i-1] = {dfs(i, vis), i};

	}

	//cerr << "\nd=" << d;

	ll fin = 0;
	vector<ll> res;

	sort(d.rbegin(), d.rend());
	vector<bool> yet(n+1, false);
	for(const auto & [len, source] : d) {

		if(yet[source]) {
			continue;
		}

		yet[source] = true;

		ll actlen = 0;

		ll curr = source;
		res.push_back(curr);
		while(yet[to[curr]] == false) {
			yet[to[curr]] = true;
			curr = to[curr];
			res.push_back(curr);
			actlen++;
		}

		fin += actlen;
	}

	cout << fin << "\n";
	for(const auto & x : res) {
		cout << x << " ";
	}

	

}

int main()
{
	std::ios_base::sync_with_stdio(false);
	//cin.tie(nullptr);
	//cout.tie(nullptr);

	solve();

	return 0;
}