H,W = map(int,input().split())
A = [list(map(int,input().split())) for _ in range(H)]

dat = [0] * 10
for h in range(H):
    for w in range(W):
        dat[A[h][w]] += 1

now = 0
for h in range(H):
    for w in range(W):
        while dat[now] == 0:
            now += 1
        print(now,end = ' ')
        dat[now] -= 1
    print()