h, w = map(int, input().split())
cnt_s = {}
for i in range(11):
    cnt_s[i] = 0
cnt_s[10] = -1
for _ in range(h):
    row = list(map(int, input().split()))
    for num in row:
        cnt_s[num] += 1
num = 0
cnt = 0
while 0 == cnt_s[num]:
    num += 1
ans = [[0 for _ in range(w)] for _ in range(h)]
for i in range(h):
    for j in range(w):
        ans[i][j] = num
        cnt += 1
        while cnt == cnt_s[num]:
            cnt = 0
            num += 1
for row in ans:
    print(*row)