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 CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const int MAX = 1000 + 5;
const int INF = 0x3f3f3f3f;
int a[MAX];
int b[MAX];
int main() {
  int n, k;
  cin >> n >> k;
  for (int i = 1; i <= n; i++) cin >> a[i], b[i] = a[i];
  sort(a + 1, a + n + 1);
  int s, y;
  s = a[n] / k;
  y = a[n] % k;
  int flag = 1;
  for (int i = n - 1; i >= 1; i--) {
    if ((a[i] / k == s - 1 && a[i] % k >= y) || (a[i] / k == s))
      flag = 1;
    else
      flag = 0;
    if ((a[i] / k == s && a[i] % k > y) || (a[i] / k > s)) {
      s = a[i] / k;
      y = a[i] % k;
    }
  }
  if (!flag)
    cout << "NO" << endl;
  else {
    cout << "YES" << endl;
    for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= b[i]; j++)
        cout << ((j % k) > 0 ? (j % k) : (k)) << ' ';
      cout << endl;
    }
  }
  return 0;
}