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.io.*;
import java.util.*;

public class Main {

    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        FastReader(InputStreamReader in) {
            try {
                br = new BufferedReader(in);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        public String readLine() {
            try {
                return br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        public String next() {
            while (st == null || !st.hasMoreElements())
            {
                st = new StringTokenizer(readLine());
            }
            return st.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }

        public char nextChar() {
            return next().charAt(0);
        }

    }

    static class FastWriter {
        BufferedWriter out;
        Formatter frm;

        FastWriter(OutputStreamWriter writer) {
            out = new BufferedWriter(writer);
            frm = new Formatter(out);
        }

        FastWriter printf(String format, Object... args) {
            frm.format(format, args).flush();
            return this;
        }

        FastWriter print(String str) {
            try {
                out.write(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return this;
        }

        FastWriter print(int x) {
            return print(Integer.toString(x));
        }

        FastWriter print(long x) {
            return print(Long.toString(x));
        }

        FastWriter print(double x) {
            return print(Double.toString(x));
        }

        FastWriter print(char c) {
            try {
                out.write(c);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return this;
        }

        FastWriter print(Object x) {
            return print(x.toString());
        }

        FastWriter flush() {
            try {
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return this;
        }

        FastWriter space() {
            return print(' ');
        }

        FastWriter endl() {
            try {
                out.newLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return this;
        }

        public void close() {
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    static FastReader reader;
    static BufferedWriter out;

    public static void main(String[] args) {
        new Solver(new FastReader(new InputStreamReader(System.in)),
                new FastWriter(new OutputStreamWriter(System.out)));
        /*try {
            FileReader fin = new FileReader("input.txt");
            FileWriter fout = new FileWriter("output.txt");
            new Solver(new FastReader(fin), new FastWriter(fout));
        } catch (Exception e) {
            e.printStackTrace();
        }*/
    }
}

class Solver {
    Main.FastReader cin; Main.FastWriter cout;


    void main() {
        int n = cin.nextInt();
        int[] a = new int[n + 1];
        int[] w = new int[n + 1];
        Arrays.fill(w, 0);
        for (int i = 1; i <= n; i++)
            a[i] = cin.nextInt();

        int[] b = new int[n + 1];
        int bc = 0;
        int single = -1;
        int ops = 0;
        for (int i = 1; i <= n; i++) {
            if (w[i] != 0) continue;
            int cur = i;
            while (w[cur] == 0) {
                ops++;
                w[cur] = 1;
                cur = a[cur];
            }
            if (w[cur] == 1) {
                b[bc++] = cur;
                if (a[cur] == cur) single = cur;
            }

            cur = i;
            while (w[cur] != 2) {
                ops++;
                w[cur] = 2;
                cur = a[cur];
            }

            if (ops > 2 * n)
                assert false;
        }

        int ans = 0;
        if (single == -1) single = b[0];
        for (int i = 0; i < bc; i++) {
            if (a[b[i]] != single) {
                a[b[i]] = single;
                ans++;
            }
        }

        cout.printf("%d\n", ans);
        for (int i = 1; i <= n; i++) cout.printf("%d ", a[i]);
    }

    Solver(Main.FastReader reader, Main.FastWriter writer) {
        cin = reader;
        cout = writer;
        main();
        writer.close();
    }
}