With the development of physics,scientists have discovered more and more particles.Perhaps one day scientists will find a special kind of particles,because they must pairs of produce or disappear.
Now we need to design an experiment destroy all of the special particles.Experimental device is a eight camera cube,each camera occupies a vertex,Numbers for A,B,C····,H.
Each camera started all have a certain number of special particle, different cameras inside the number of special particles may be different.
Every time can choose between two neighboring vertex, let them simultaneously in a special particles produced or disappear.
For example: if eight cameras have 1,0,1,0,3,1,0,0,special particle,So a legitimate operation is "EF-,EA-,AD+,AE-,DC-".
