graph_size = int(input())

while graph_size > 0:
    adjecencies = []

    for i in range(graph_size):
        adjecencies.append(
            [i for i, v in enumerate(list(map(int, input().split()))) if v == 1]
        )

    weak_nodes = []

    for i, nodes in enumerate(adjecencies):
        weak = True

        for node in nodes:

            for next_node in adjecencies[node]:
                if i in adjecencies[next_node]:
                    weak = False
                    break

            if not weak:
                break

        if weak:
            weak_nodes.append(i)

    print(" ".join(map(str, weak_nodes)))

    graph_size = int(input())