1. First raise your hands and shake your index finger left, right, left and right four times; 2. Clap your hands and punch at the same time (rock, paper, scissors); 3. Remember who wins and loses after punching, and then clap your hands; 4. Both sides casually point their fingers in one of the four directions. The loser of rock, paper, scissors can't point in the same direction as the winner, otherwise he will lose.

If the two sides point in different directions, repeat step 2.