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 PYTHON):

Solution:
n, k = map(int, raw_input().split())

pebbles = [int(x) for x in raw_input().split()]


def check(pebbles):
	if max(pebbles) - min(pebbles) > k:
		return False
	return True


flag = check(pebbles)


def process(pebbles, flag):
	if not flag:
		print "NO"
	else:
		op = {x : [] for x in xrange(len(pebbles))}
		curr_color = 0
		done = False
		while not done:
			one = False
			for i in range(len(pebbles)):
				if pebbles[i] > 0:
					one = True
					op[i].append(str((curr_color % k) + 1))
					
					pebbles[i] -= 1
			curr_color += 1
			if not one:
				done = True
		print "YES"
		for i in range(len(pebbles)):
			print " ".join(op[i])

process(pebbles, flag)