n = int(input())
pa = []
for i in range(n):
    pa.append(list(map(int, input().split())))

li = []
for i in range(n):
    for j in range(1, pa[i][0]+1):
        li.append((j, pa[i][j]))

li.sort()
ans = [li[i][1] for i in range(len(li))]
print(*ans)