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>
int a[40][40];
int b[1000];
int main() {
  int n, k;
  while (scanf("%d%d", &n, &k) == 2) {
    int i, j, p;
    memset(a, 0, sizeof(a));
    memset(b, 0, sizeof(b));
    int x;
    for (i = 1; i <= k; i++) {
      scanf("%d", &x);
      b[x] = 1;
      a[i][0] = x;
    }
    for (i = 1; i <= k; i++) {
      for (j = 1; j < n; j++) {
        for (p = 1; p <= n * k; p++) {
          if (b[p] == 0) {
            a[i][j] = p;
            b[p] = 1;
            break;
          }
        }
      }
    }
    for (i = 1; i <= k; i++) {
      for (j = 0; j < n; j++) {
        printf("%d ", a[i][j]);
      }
      printf("\n");
    }
  }
  return 0;
}