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.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class C844{

	void solve()
	{
		int n = ni();
		int[] a = ia(n);
		long[] b = new long[n];
		for(int i=0;i<n;i++)
			b[i] = (long)a[i] << 32 | i;
		Arrays.sort(b);
		int cyc = 0;
		boolean[] vis = new boolean[n];
		StringBuilder ans = new StringBuilder();
		for(int i=0;i<n;i++)
		{
			if(!vis[i])
			{
				cyc++;
				StringBuilder sb = new StringBuilder();
				int cyl = cycleLength(b[i], b, vis, sb);
				ans.append(cyl + " " + sb + "\n");
			}
		}
		out.println(cyc);
		out.println(ans);
	}
	
	int cycleLength(long cur, long[] b, boolean[] vis, StringBuilder sb)
	{
		int cn = 0;
		while(!vis[(int)cur])
		{
			vis[(int)cur] = true;
			sb.append(1 + (int)cur + " ");
			cur = b[(int)cur];
			cn++;
		}
		return cn;
	}
	
	public static void main(String[] args){new C844().run();}
	
	private byte[] bufferArray = new byte[1024];
	private int bufLength = 0;
	private int bufCurrent = 0;
	InputStream inputStream;
	PrintWriter out;
	
	public void run()
	{
		inputStream = System.in;
		out = new PrintWriter(System.out);
		solve();
		out.flush();
	}
	
	int nextByte()
	{
		if(bufLength==-1)
			throw new InputMismatchException();
		if(bufCurrent>=bufLength)
		{
			bufCurrent = 0;
			try
			{bufLength = inputStream.read(bufferArray);}
			catch(IOException e)
			{ throw new InputMismatchException();}
			if(bufLength<=0)
				return -1;
		}
		return bufferArray[bufCurrent++];
	}
	
	boolean isSpaceChar(int x)
	{return (x<33 || x>126);}
	
	boolean isDigit(int x)
	{return (x>='0' && x<='9');}
	
	int nextNonSpace()
	{
		int x;
		while((x=nextByte())!=-1 && isSpaceChar(x));
		return x;
	}
	
	int ni()
	{
		long ans = nl();
		if ( Integer.MIN_VALUE <= ans && ans <= Integer.MAX_VALUE )
			return (int)ans;
		throw new InputMismatchException();
	}
	
	long nl()
	{
		long ans = 0;
		boolean neg = false;
		int x = nextNonSpace();
		if(x=='-') 
		{
			neg = true;
			x = nextByte();
		}
		while(!isSpaceChar(x))
		{
			if(isDigit(x))
			{
				ans = ans*10 + x -'0';
				x = nextByte();
			}
			else
				throw new InputMismatchException();
		}
		return neg ? -ans:ans;
	}
	
	String ns()
	{
		StringBuilder sb = new StringBuilder();
		int x = nextNonSpace();
		while(!isSpaceChar(x))
		{
			sb.append((char)x);
			x = nextByte();
		}
		return sb.toString();
	}
	
	char nc()
	{ return (char)nextNonSpace();}
	
	double nd()
	{ return (double)Double.parseDouble(ns()); }
	
	char[] ca()
	{ return ns().toCharArray();}
	
	char[] ca(int n)
	{
		char[] ans = new char[n];
		int p =0;
		int x = nextNonSpace();
		while(p<n)
		{
			ans[p++] = (char)x;
			x = nextByte();
		}
		return ans;
	}
	
	int[] ia(int n)
	{
		int[] ans = new int[n];
		for(int i=0;i<n;i++)
			ans[i]=ni();
		return ans;
	}
	
}