Use pens of 5 different colors to write the five characters "today is Sunday" (in one line), and it is required that the colors of adjacent characters cannot be the same. How many different ways of writing are there?
用5种不同颜色的笔，来写"今天星期日"这五个字(写成一行)，要求相邻的字颜色不能相同，有多少种不同的写法．
<gadget id="calculator">5 * 4 * 4 * 4 * 4</gadget>
<output>1_280</output>

<result>1_280</result>