Problem: You are given a sequence a1, a2, ..., an consisting of different integers. It is required to split this sequence into the maximum number of subsequences such that after sorting integers in each of them in increasing order, the total sequence also will be sorted in increasing order.

Sorting integers in a subsequence is a process such that the numbers included in a subsequence are ordered in increasing order, and the numbers which are not included in a subsequence don't change their places.

Every element of the sequence must appear in exactly one subsequence.

Input

The first line of input data contains integer n (1 ≤ n ≤ 105) — the length of the sequence.

The second line of input data contains n different integers a1, a2, ..., an ( - 109 ≤ ai ≤ 109) — the elements of the sequence. It is guaranteed that all elements of the sequence are distinct.

Output

In the first line print the maximum number of subsequences k, which the original sequence can be split into while fulfilling the requirements.

In the next k lines print the description of subsequences in the following format: the number of elements in subsequence ci (0 < ci ≤ n), then ci integers l1, l2, ..., lci (1 ≤ lj ≤ n) — indices of these elements in the original sequence. 

Indices could be printed in any order. Every index from 1 to n must appear in output exactly once.

If there are several possible answers, print any of them.

Examples

Input

6
3 2 1 6 5 4


Output

4
2 1 3
1 2
2 4 6
1 5


Input

6
83 -75 -49 11 37 62


Output

1
6 1 2 3 4 5 6

Note

In the first sample output:

After sorting the first subsequence we will get sequence 1 2 3 6 5 4.

Sorting the second subsequence changes nothing.

After sorting the third subsequence we will get sequence 1 2 3 4 5 6.

Sorting the last subsequence changes nothing.

Solution (in JAVA):

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

public class problem {
    static Node node[];
    static boolean visited[];
    static List<List<Integer>> allList = new LinkedList<>();
    static List<Integer> list = new LinkedList<>();
    static class Node {
        List<Integer> next = new LinkedList<>();
    }
    static void dfs(int u) {
        list.add(u);
        visited[u] = true;
        for (int v : node[u].next) {
            if (!visited[v]) {
                dfs(v);
            }
        }
    }
    private static FastScanner in = new FastScanner();
    private static void solve() {
        StringBuilder ans = new StringBuilder();
        int n = in.nextInt();
        int a[][] = new int[n][2];
        for (int i = 0; i < n; i++) {
            a[i][0] = in.nextInt();
            a[i][1] = i;
        }
        Arrays.sort(a, (x, y) -> Integer.compare(x[0], y[0]));
        node = new Node[n];
        for (int i = 0; i < n; i++) {
            node[i] = new Node();
        }
        visited = new boolean[n];
        Arrays.fill(visited, false);
        for (int i = 0; i < n; i++) {
            node[i].next.add(a[i][1]);
            node[a[i][1]].next.add(i);
        }
        for (int i = 0; i < n; i++) {
            if (!visited[i]) {
                dfs(i);
                allList.add(list);
                list = new LinkedList<>();
            }
        }
        ans.append(allList.size()).append("\n");
        for (List<Integer> li : allList) {
            ans.append(li.size()).append(" ");
            for (int x : li) {
                ans.append(x + 1).append(" ");
            }
            ans.append("\n");
        }
        System.out.println(ans);
    }

    public static void main(String[] args) throws IOException {
        new problem().solve();
    }
}

class FastScanner {
    public static String debug = null;

    private final InputStream in = System.in;
    private int ptr = 0;
    private int buflen = 0;
    private byte[] buffer = new byte[1024];
    private boolean eos = false;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                if (debug != null) {
                    buflen = debug.length();
                    buffer = debug.getBytes();
                    debug = "";
                    eos = true;
                } else {
                    buflen = in.read(buffer);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen < 0) {
                eos = true;
                return false;
            } else if (buflen == 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    }

    public boolean isEOS() {
        return this.eos;
    }

    public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        return (int) nextLong();
    }

    public long[] nextLongList(int n) {
        return nextLongTable(1, n)[0];
    }

    public int[] nextIntList(int n) {
        return nextIntTable(1, n)[0];
    }

    public long[][] nextLongTable(int n, int m) {
        long[][] ret = new long[n][m];
        for (int i = 0; i < n; i ++) {
            for (int j = 0; j < m; j ++) {
                ret[i][j] = nextLong();
            }
        }
        return ret;
    }

    public int[][] nextIntTable(int n, int m) {
        int[][] ret = new int[n][m];
        for (int i = 0; i < n; i ++) {
            for (int j = 0; j < m; j ++) {
                ret[i][j] = nextInt();
            }
        }
        return ret;
    }
}