[CodeUp] 1425 : 자리 배치

a,b=map(int,input().split())

x= list(map(int,input().split()))


for i in range(a):
    for j in range(i,a):
        if x[i] > x[j]:
            t=x[j]
            x[j]=x[i]
            x[i]=t




c=0

while True:

    if c==a:
        break
    for j in range(b):

        print(x[c],end=" ")
        c+=1
        if c==a:
            break
    print()