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 ProblemA {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		FastScanner input = new FastScanner();
		int n = input.nextInt();
		int[] inputArray = input.readIntArray(n);
		ArrayList<Integer> inputList = new ArrayList<Integer>();
		for(int i:inputArray){
			inputList.add(i);
		}
		
		Compressor<Integer> compressor = new Compressor<Integer>(inputList);
		
		ArrayList<ArrayList<Integer>> outputLists = new ArrayList<>();
		boolean[] marked = new boolean[n];
				
		for(int a = 0; a < n; a++){
			if(marked[a] == false){
				HashSet<Integer> foundSoFar = new HashSet<Integer>();
				ArrayList<Integer> cycle = new ArrayList<Integer>();
				int cycleIdx = a;
				while(foundSoFar.contains(cycleIdx) == false){
					marked[cycleIdx] = true;
					cycle.add(cycleIdx);
					foundSoFar.add(cycleIdx);
					int value = compressor.compress(inputArray[cycleIdx]);
					cycleIdx = value;
				}
				outputLists.add(cycle);
			}
		}
		StringBuilder output = new StringBuilder();
		output.append(outputLists.size() + "\n");
		for(ArrayList<Integer> idx : outputLists){
			output.append(idx.size() + " ");
			for(Integer i: idx){
				output.append((i+1) + " ");
			}
			output.append("\n");
		}
		System.out.print(output);
		
		
	}
	public static class Compressor<T extends Comparable<T>> {
        Map<T, Integer> real2compressed = new HashMap<>();
        List<T> compressed2real = new ArrayList<>();

        Compressor(List<T> realC) {
            Collections.sort(realC);
            int cx = 0;
            T lastreal = null;
            for (T realx : realC) {
                if (!realx.equals(lastreal)) {
                    real2compressed.put(realx, cx++);
                    compressed2real.add(realx);
                }
                lastreal = realx;
            }
        }
        int size() {
            return real2compressed.size();
        }
        int compress(T real) { return real2compressed.get(real); }
        T uncompress(int comp) { return compressed2real.get(comp); }
    }
    public static class FastScanner {
        BufferedReader br;
        StringTokenizer st;
        public FastScanner(Reader in) {
            br = new BufferedReader(in);
        }
        public FastScanner() {
            this(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 nextInt() {
            return Integer.parseInt(next());
        }
        long nextLong() {
            return Long.parseLong(next());
        }
        double nextDouble() {
            return Double.parseDouble(next());
        }
        String readNextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
        int[] readIntArray(int n) {
            int[] a = new int[n];
            for (int idx = 0; idx < n; idx++) {
                a[idx] = nextInt();
            }
            return a;
        }
        long[] readLongArray(int n) {
            long[] a = new long[n];
            for (int idx = 0; idx < n; idx++) {
                a[idx] = nextLong();
            }
            return a;
        }
    }
}