You are given a stream of sequence, and you have to print all the person in the same generation. \n\n```\nAlice -> Bob, Tom\nTom -> Jerry, Phillip\n```\n\nFor this input, it would be \n```\nGen 1: Alice\nGen 2: Bob, Tom\nGen 3: Jerry, Phillip\n```\n\nThe question was quite clear (using topological sorting) if the data was a static, but the interviewer mentioned that it\'s a stream of data. \n\nSo later on, another data can come in with something like this: \n```\nJohn -> Alice\n```\n\nSo now, the answer would be:\nFor this input, it would be \n```\nGen 1: John\nGen 2: Alice\nGen 3: Bob, Tom\nGen 4: Jerry, Phillip\n```\n\nThe question was quite vague, but became clear after asking relevant hints from the interviewer. \n

You are given a stream of sequence, and you have to print all the person in the same generation. \n\n\nAlice -> Bob, Tom\nTom -> Jerry, Phillip\n\n\nFor this in