Write the four letters "JYSX" with 5 different colors of colored pens. The colors of each letter cannot be the same. How many different ways of writing are there?
用5种不同颜色的彩笔写"JYSX"四个字母，每个字母的颜色都不能相同，一共有多少种不同的写法．
<gadget id="calculator">5 * 4 * 3 * 2</gadget>
<output>120</output>

<result>120</result>