Problem: There are n piles of pebbles on the table, the i-th pile contains ai pebbles. Your task is to paint each pebble using one of the k given colors so that for each color c and any two piles i and j the difference between the number of pebbles of color c in pile i and number of pebbles of color c in pile j is at most one.

In other words, let's say that bi, c is the number of pebbles of color c in the i-th pile. Then for any 1 ≤ c ≤ k, 1 ≤ i, j ≤ n the following condition must be satisfied |bi, c - bj, c| ≤ 1. It isn't necessary to use all k colors: if color c hasn't been used in pile i, then bi, c is considered to be zero.

Input

The first line of the input contains positive integers n and k (1 ≤ n, k ≤ 100), separated by a space — the number of piles and the number of colors respectively.

The second line contains n positive integers a1, a2, ..., an (1 ≤ ai ≤ 100) denoting number of pebbles in each of the piles.

Output

If there is no way to paint the pebbles satisfying the given condition, output "NO" (without quotes) .

Otherwise in the first line output "YES" (without quotes). Then n lines should follow, the i-th of them should contain ai space-separated integers. j-th (1 ≤ j ≤ ai) of these integers should be equal to the color of the j-th pebble in the i-th pile. If there are several possible answers, you may output any of them.

Examples

Input

4 4
1 2 3 4


Output

YES
1
1 4
1 2 4
1 2 3 4


Input

5 2
3 2 4 1 3


Output

NO


Input

5 4
3 2 4 3 5


Output

YES
1 2 3
1 3
1 2 3 4
1 3 4
1 1 2 3 4

Solution (in JAVA):

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

public class PaintingPebbles {
	public static void main(String args[]){
		FScanner in = new FScanner();
		PrintWriter out = new PrintWriter(System.out);
		int n = in.nextInt();
		int k = in.nextInt();
	    int min=101,max=0,a=1;
		
		int arr[]=in.readArray(n);

		for(int i=0;i<n;i++)
		{
			max=Math.max(max,arr[i]);
			min=Math.min(min,arr[i]);
		}

		if(max-k<=0||max-k<=min)
			{ out.println("YES");
		for(int i=0;i<n;i++)
		{
			for(int j=0;j<arr[i];j++)
			{
				if(j+1<=k)
				out.print(j+1+" ");
			else
				{ out.print(a+" ");a++;
			if(a>k) a=1;}
			}
			out.println();a=1;
		}
	}
	  else
	  	out.println("NO");
		out.close();
	}

	static boolean checkprime(int n1)
	{
		if(n1%2==0||n1%3==0)
			return false;
		else 
		{
			for(int i=5;i*i<=n1;i+=6)
			{
				if(n1%i==0||n1%(i+2)==0)
					return false;
			}
			return true;
		}
	}
	
	static class FScanner {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer sb = new StringTokenizer("");

		String next(){
			while(!sb.hasMoreTokens()){
				try{
					sb = new StringTokenizer(br.readLine());
				} catch(IOException e){ }
			}
			return sb.nextToken();
		}
		String nextLine(){
			try{ return br.readLine(); } 
			catch(IOException e) { } return "";
		}

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

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

		int[] readArray(int n) {
			int a[] = new int[n];
			for(int i=0;i<n;i++) a[i] = nextInt();
			return a;
		}

		float nextFloat(){
		return Float.parseFloat(next());
		}
		
		double nextDouble(){
		return Double.parseDouble(next());
		}
	}
}