From the school physics course, you know that charges of the same name are repelled, and unlike charges are attracted. These are the rules you will use when completing levels in the Polarity Switch game. If we consider specific examples, then two objects with pluses and two with minuses will bounce off each other, and the figure with minus and plus will stick to each other. Your task is to use a square with a plus sign to force all other circles to take positions in round niches specially drawn for this. Remember the rules, you need to take them into account. Otherwise, the problem cannot be solved. The game is similar to sokoban, but with elements of physics.