For each case, first output an integer L in a line, which should represent the length of the switch sequence you found.
If no switch sequence can transform G into H, then you should print L as -1 and no more lines. Otherwise output L lines follow. Each of the L lines should contains four distinct integers x, y, z and w, indicating a 2-switch on G, as described.
For some reason, if L is equal to or larger than 1000000, ivankevin would think the switch sequence you found is so ugly that it is ungelieveble and unacceptable. Otherwise, if L < 1000000 and the sequence finally transform G into H, he will accept your answer.