Problem: A tree is an undirected connected graph without cycles.

Let's consider a rooted undirected tree with n vertices, numbered 1 through n. There are many ways to represent such a tree. One way is to create an array with n integers p1, p2, ..., pn, where pi denotes a parent of vertex i (here, for convenience a root is considered its own parent).

<image> For this rooted tree the array p is [2, 3, 3, 2].

Given a sequence p1, p2, ..., pn, one is able to restore a tree:

  1. There must be exactly one index r that pr = r. A vertex r is a root of the tree. 
  2. For all other n - 1 vertices i, there is an edge between vertex i and vertex pi. 



A sequence p1, p2, ..., pn is called valid if the described procedure generates some (any) rooted tree. For example, for n = 3 sequences (1,2,2), (2,3,1) and (2,1,3) are not valid.

You are given a sequence a1, a2, ..., an, not necessarily valid. Your task is to change the minimum number of elements, in order to get a valid sequence. Print the minimum number of changes and an example of a valid sequence after that number of changes. If there are many valid sequences achievable in the minimum number of changes, print any of them.

Input

The first line of the input contains an integer n (2 ≤ n ≤ 200 000) — the number of vertices in the tree.

The second line contains n integers a1, a2, ..., an (1 ≤ ai ≤ n).

Output

In the first line print the minimum number of elements to change, in order to get a valid sequence.

In the second line, print any valid sequence possible to get from (a1, a2, ..., an) in the minimum number of changes. If there are many such sequences, any of them will be accepted.

Examples

Input

4
2 3 3 4


Output

1
2 3 4 4 


Input

5
3 2 2 5 3


Output

0
3 2 2 5 3 


Input

8
2 3 5 4 1 6 6 7


Output

2
2 3 7 8 1 6 6 7

Note

In the first sample, it's enough to change one element. In the provided output, a sequence represents a tree rooted in a vertex 4 (because p4 = 4), which you can see on the left drawing below. One of other correct solutions would be a sequence 2 3 3 2, representing a tree rooted in vertex 3 (right drawing below). On both drawings, roots are painted red.

<image>

In the second sample, the given sequence is already valid.

Solution (in JAVA):

Solution:
import java.util.*;
import java.math.*;
import java.io.*;
import java.text.*;

public class A {
    static class Node implements Comparable<Node>{
        int x;
        long cost;
        public Node(int x,long cost){
            this.x=x;
        }
        public int compareTo(Node c){
            return Long.compare(this.cost,c.cost);
        }
    }
    //public static PrintWriter pw;
    public static PrintWriter pw = new PrintWriter(System.out);

    public static void solve() throws IOException {
    //	pw=new PrintWriter(new FileWriter("C:\\Users\\shree\\Downloads\\small_output_in"));
            FastReader sc = new FastReader();
            int n=sc.I();
            a=new int[n+1];
            graph=new Vector[n+1];
            for(int i=1;i<=n;i++) graph[i]=new Vector<>();
            for(int i=1;i<=n;i++){
                a[i]=sc.I();

                graph[i].add(a[i]);
                if(a[i]==i){
                    root=i;
                    prev=root;
                }
            }

            vis=new boolean[n+1];
            stk=new boolean[n+1];
            for(int i=1;i<=n;i++){
                if(!vis[i]){

                    dfs(i);

                }
             }
             pw.println(ans);
            for(int i=1;i<=n;i++) pw.print(a[i]+" ");




            pw.close();

    }
    static int ans=0;
    static int root=-1;
    static Vector<Integer> graph[];

    static boolean vis[];
    static boolean stk[];
    static int prev=-1;
    static int a[];
    static ArrayList<Integer> v1=new ArrayList<>();

    static void dfs(int v){
        vis[v]=true;
        stk[v]=true;

        for(int u : graph[v]){
            if(!vis[u]) dfs(u);
            else if(stk[u]) {
               // pw.println(v+" "+a[v]+" "+prev+" "+root);
                if(root==-1){
                    root=v;
                    a[v]=v;
                    prev=v;
                    ans++;
                }else {
                    if(prev!=-1 && v!=root){
                        a[v]=prev;
                        ans++;
                    }
                    prev=v;
                }


            }
        }
        stk[v]=false;
    }

    public static void main(String[] args) {
        new Thread(null, new Runnable() {
            public void run() {
                try {

                    solve();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }, "1", 1 << 26).start();

    }

    static BufferedReader br;
    static long M = (long) 1e9 + 7;

    static class FastReader {

        StringTokenizer st;

        public FastReader() throws FileNotFoundException {
            //br=new BufferedReader(new FileReader("C:\\Users\\shree\\Downloads\\B-small-practice.in"));
            br = new BufferedReader(new InputStreamReader(System.in));

        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int I() {
            return Integer.parseInt(next());
        }

        long L() {
            return Long.parseLong(next());
        }

        double D() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }

        public boolean hasNext() throws IOException {
            while (st == null || !st.hasMoreTokens()) {
                String s = br.readLine();
                if (s == null) {
                    return false;
                }
                st = new StringTokenizer(s);
            }
            return true;
        }

    }
}