There are 10 black and white chess pieces in the box. Take out 2 pieces from it each time, if it is the same color, put a black piece in the box; if it is a different color, put a white piece in the box. After 19 times, what color is the remaining chess piece?
箱中有黑白棋子各10枚．每次从中取出2枚，若是同色，则向箱中放一枚黑子；若是异色，则向箱中放一枚白子．经19次后还剩一枚棋子是什么颜色？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 / 1</gadget>
<output>14</output>

<gadget id="calculator">14 + 5</gadget>
<output>19</output>

<result>19</result>