yoba = [ 0, 1, 4, 6, 3, 4, 0, 0, 4, 2, 4 ]
for i, x in enumerate(filter(None, yoba)):
print('{} --{}--'.format(x, 1 if i%2==0 else 2))
eW9iYSA9IFsgMCwgMSwgNCwgNiwgMywgNCwgMCwgMCwgNCwgMiwgNCBdCmZvciBpLCB4IGluIGVudW1lcmF0ZShmaWx0ZXIoTm9uZSwgeW9iYSkpOgogICAgcHJpbnQoJ3t9IC0te30tLScuZm9ybWF0KHgsIDEgaWYgaSUyPT0wIGVsc2UgMikp