Xiaohong and Xiaoling play forward or backward games (forward is represented by "+"); +5 steps, -4 steps, -3 steps, +2 steps, +1 steps. Do you know whether they moved forward or retreated in the end? If you have advanced, how many steps have you advanced? If you retreated, how many steps did you retreat?
小红和小玲玩前进或后退游戏(前进用"+"表示)；+5步，-4步，-3步，+2步，+1步．你知道她们最后是前进了，还是后退了吗？若是前进了，则前进了几步？若是后退了，则后退了几步？
<gadget id="calculator">5 + (-4) + (-3) + 2 + 1</gadget>
<output>1</output>

<result>1</result>