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.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.StringTokenizer;
import java.util.TreeMap;


public class A {

	static StringTokenizer st;
	static BufferedReader br;
	static PrintWriter pw;
	static class Sort implements Comparable<Sort> {
		int val, ind;
		public int compareTo(Sort arg0) {
			return this.val-arg0.val;
		};
	}
	static int[]p;
	static Random rm;
	public static void main(String[] args) throws IOException {
		br = new BufferedReader(new InputStreamReader(System.in));
		pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
		int n = nextInt();
		Sort[]a = new Sort[n];
		for (int i = 0; i < n; i++) {
			a[i] = new Sort();
			a[i].val = nextInt();
			a[i].ind = i;
		}
		Arrays.sort(a);
		int[]b = new int[n];
		int max = 0;
		b[a[0].ind] = max;
		for (int i = 1; i < n; i++) {
			if (a[i].val != a[i-1].val)
				max++;
			b[a[i].ind] = max;
		}
		rm = new Random();
		ArrayList<Integer>[]groups = new ArrayList[n];
		p = new int[n];
		for (int i = 0; i < n; i++) {
			groups[i] = new ArrayList<>();
		}
		int[]ind = new int[n];
		for (int i = 0; i < n; i++) {
			ind[b[i]] = i;
			p[i] = i;
		}
		int cntGroups = 0;
		for (int i = 0; i < n; i++) {
			if (ind[i] != i) {
				unite(b[i], i);
				ind[b[i]] = ind[i];
				b[ind[i]] = b[i];
				ind[i] = i;
			}
		}
		for (int i = 0; i < n; i++) {
			groups[get(i)].add(i);
		}
		for (int i = 0; i < n; i++) {
			if (!groups[i].isEmpty())
				cntGroups++;
		}
		pw.println(cntGroups);
		for (int i = 0; i < n; i++) {
			if (!groups[i].isEmpty()) {
				pw.print(groups[i].size()+" ");
				for (int j : groups[i]) {
					pw.print((j+1)+" ");
				}
				pw.println();
			}
		}
		pw.close();
	}
	private static void unite(int a, int b) {
		int pa = get(a);
		int pb = get(b);
		if (pa != pb) {
			if (rm.nextInt() % 2==0)
				p[pa] = pb;
			else
				p[pb] = pa;
		}
	}
	private static int get(int v) {
		if (p[v]==v)
			return v;
		return p[v] = get(p[v]);
	}
	private static int nextInt() throws IOException {
		return Integer.parseInt(next());
	}
	private static long nextLong() throws IOException {
		return Long.parseLong(next());
	}
	private static double nextDouble() throws IOException {
		return Double.parseDouble(next());
	}
	private static String next() throws IOException {
		while (st==null || !st.hasMoreTokens())
			st = new StringTokenizer(br.readLine());
		return st.nextToken();
	}
}