n = int(input())
l = [list(map(int, input().split())) for _ in range(n)]
p = max([l[i][0] for i in range(n)])
for i in range(n): 
	l[i]=l[i][1:]+[0]*(p-l[i][0])
l = [i for i in sum(zip(*l),()) if i>0]
print(*l)