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 *a*<sub class="lower-index">*i*</sub> (1 ≤ *a*<sub class="lower-index">*i*</sub> ≤ *n*·*k*). All numbers *a*<sub class="lower-index">*i*</sub> 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 *a*<sub class="lower-index">*i*</sub> for sure; -  no segment goes to two children simultaneously. 
Help the children, divide the orange and fulfill the requirements, described above.
The first line contains two integers *n*, *k* (1 ≤ *n*, *k* ≤ 30). The second line contains *k* space-separated integers *a*<sub class="lower-index">1</sub>, *a*<sub class="lower-index">2</sub>, ..., *a*<sub class="lower-index">*k*</sub> (1 ≤ *a*<sub class="lower-index">*i*</sub> ≤ *n*·*k*), where *a*<sub class="lower-index">*i*</sub> is the number of the orange segment that the *i*-th child would like to get.

It is guaranteed that all numbers *a*<sub class="lower-index">*i*</sub> are distinct.
n , k = map(int,input().split())
oranges_segment = [i for i in range(1,(n*k)+1)]
j = 0
*to_be_given, = map(int,input().split())
to_be_not_given = [str(i) for i in range(1,(n*k)+1) if i not in to_be_given]
n_1_items_extracted = [ ]
#print(to_be_not_given)
def extractor():  
    for faltu in range(n):
        temporary_item = to_be_not_given.pop(0)
        n_1_items_extracted.append(temporary_item)
        #print(n_1_items_extracted)
        #print(to_be_not_given)
        if len(n_1_items_extracted) == n-1:
            break
    

for agrambagram in range(k):
    extractor()
    pre_final_string = str(to_be_given[agrambagram])+ "".join(n_1_items_extracted)
    final_string = sorted(pre_final_string,key=int)
    print(" ".join(final_string))
    n_1_items_extracted = []
    