h,w = map(int,input().split())
from collections import Counter
result = []
for i in range(h):
    result += list(map(int,input().split()))
result = dict(sorted(Counter(result).items()))
result2 = []
for key,value in result.items():
    result2+=[int(key)]*value
result3 = []    
for i in range(0,h*w,w):
    print(*result2[i:i+w])