import sys
input = sys.stdin.readline
from operator import itemgetter

N,M=map(int,input().split())
A=[list(map(int,input().split())) for i in range(N)]

B=[]

for i in range(N):
    X=A[i]
    Y=[[X[j],j+1] for j in range(N)]

    Y.sort(key=itemgetter(0),reverse=True)
    B.append(Y)

ANS=[]

for tests in range(M):
    X=[]*N
    USE=[0]*(N+1)

    for i in range(N):
        for j in range(N):
            w,ind=B[i][j]

            if w>0 and USE[ind]==0:
                X.append(ind)
                USE[ind]=1
                B[i][j][0]-=1
                break

        B[i].sort(key=itemgetter(0),reverse=True)

    if len(X)==N:
        ANS.append(X)
    else:
        print(-1)
        exit()

for i in range(N):
    for j in range(N):
        if B[i][j][0]>0:
            print(-1)
            exit()

for ans in ANS:
    print(*ans)