def main():
    n = int(input())
    a = [[] for _ in range(n)]

    for i in range(n):
        _, *a[i] = map(int, input().split())
        a[i] = a[i][::-1]  # pop用に逆順にする

    for i in range(10 ** 5):
        if a[i % n]:
            print(a[i % n].pop(), end=" ")
            if not any(a):  # 全員さばけたら終わり
                exit()


if __name__ == "__main__":
    main()