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:
//to paint the pebbles so that differences at most is one
import java.util.*;
import java.lang.*;
public class cf24
{
	public static void main(String args[])
	{
		Scanner scan=new Scanner(System.in);
		int n=scan.nextInt(),k=scan.nextInt(),i=0,j=0;
		int a[]=new int[n],m;
		for(i=0;i<n;i++)
		{
			a[i]=scan.nextInt();
		}
		for(i=0;i<n-1;i++)
		{
			for(j=i+1;j<n;j++)
			{
				if(Math.abs(a[i]-a[j])>k)
				{
					System.out.print("NO");return;
				}			
			}		
		}
		System.out.println("YES");
		for(i=0;i<n;i++)
		{
			m=1;
			for(j=0;j<a[i];j++)
			{
				System.out.print(m+++" ");
				if(m==k+1)
				{
					m=1;
				}
			}
			System.out.println();
		}
	}
}