‘XXXXH’为蛇的初始长度和样子。虽然好难看。

‘$’为食物（为什么要是钱。。还要是dollar）

‘A’:左前进一步

‘D’:右前进一步

‘W’:上前进一步

‘S’:下前进一步

千万不要想不开撞墙或者吃自己。不然就结束了。-' XXXXH'　snake initial length and appearance. Although good ugly. ' $'　For the food (why .. even if the money is dollar) ' A' : Left Front further ' D' : right anterior further ' W' : forward further ' S' : next step forward, do not take things too hard against the wall or to eat their own. Otherwise it ends.