On Saturday, June 11, 2016 at 8:56:00 PM UTC+3, eatmore wrote:
> Each program must contain at least one instruction.

Thank you, can't believe I missed it. I was starring at this for the last hour 
of the competition. The fix is trivial and I just checked it on practice it 
works:

    val Array(n,l) =in.readLine().split(" ").map(_.toInt)
    val good = in.readLine().split(" ")
    val bad = in.readLine()
    if (good.contains(bad)) "IMPOSSIBLE" else {
      if (l == 1) "? 0" else
      "?"*(l-1) + " " + ("10"*50+ "?" + "1")
    }

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