n = int(input())
A = [0]*n
for i in range(n):
    temp = list(map(int, input().split()))
    if len(temp) == 1:
        A[i] = []
    else:
        a = temp[1:]
        a.reverse()
        A[i] = a

ans = []
while True:
    cnt = 0
    for i in range(n):
        if A[i]:
            ans.append(A[i].pop())
        else:
            cnt += 1
    if cnt == n:
        break
print(*ans)