Problem: One day Ms Swan bought an orange in a shop. The orange consisted of n·k segments, numbered with integers from 1 to n·k. 

There were k children waiting for Ms Swan at home. The children have recently learned about the orange and they decided to divide it between them. For that each child took a piece of paper and wrote the number of the segment that he would like to get: the i-th (1 ≤ i ≤ k) child wrote the number ai (1 ≤ ai ≤ n·k). All numbers ai accidentally turned out to be different.

Now the children wonder, how to divide the orange so as to meet these conditions:

  * each child gets exactly n orange segments; 
  * the i-th child gets the segment with number ai for sure; 
  * no segment goes to two children simultaneously. 



Help the children, divide the orange and fulfill the requirements, described above.

Input

The first line contains two integers n, k (1 ≤ n, k ≤ 30). The second line contains k space-separated integers a1, a2, ..., ak (1 ≤ ai ≤ n·k), where ai is the number of the orange segment that the i-th child would like to get.

It is guaranteed that all numbers ai are distinct.

Output

Print exactly n·k distinct integers. The first n integers represent the indexes of the segments the first child will get, the second n integers represent the indexes of the segments the second child will get, and so on. Separate the printed numbers with whitespaces.

You can print a child's segment indexes in any order. It is guaranteed that the answer always exists. If there are multiple correct answers, print any of them.

Examples

Input

2 2
4 1


Output

2 4 
1 3 


Input

3 1
2


Output

3 2 1 

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  cin >> n >> k;
  int a[31];
  for (int i = 1; i <= k; i++) cin >> a[i];
  int tmp[901];
  for (int i = 0; i < 901; i++) tmp[i] = -1;
  for (int i = 1; i <= k; i++) tmp[a[i]] = i;
  int cnt = 0;
  for (int i = 1; i <= n * k; i++) {
    if (tmp[i] == -1) {
      tmp[i] = (cnt++) % k + 1;
    }
  }
  multimap<int, int> m;
  multimap<int, int>::iterator mp;
  for (int i = 1; i <= n * k; i++) m.insert(pair<int, int>(tmp[i], i));
  for (int i = 1; i <= k; i++) {
    for (mp = m.lower_bound(i); mp != m.upper_bound(i); mp++) {
      if (mp != m.lower_bound(i)) cout << ' ';
      cout << mp->second;
    }
    cout << endl;
  }
}