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;
vector<int> v[35];
bool d[905];
void input() {
  int i, j, k, n, n2, idx, cnt, x;
  scanf("%d %d", &n, &k);
  for ((i) = 0; (i) < (k); (i)++)
    scanf("%d", &x), v[i].push_back(x), d[x] = true;
  idx = 0, cnt = 1;
  n2 = n * k;
  for ((i) = (1); (i) <= (n2); (i)++)
    if (!d[i]) {
      v[idx].push_back(i);
      cnt++;
      if (cnt == n) idx++, cnt = 1;
    }
  for ((i) = 0; (i) < (k); (i)++) {
    for ((j) = 0; (j) < (v[i].size()); (j)++) printf("%d ", v[i][j]);
    printf("\n");
  }
}
int main() {
  input();
  return 0;
}