Using the four numbers 1, 2, 3, and 4 to form a four-digit number, what is the difference between the largest number and the smallest number?
用1、2、3、4这四个数字组成四位数，最大数与最小数的差是多少．
<gadget id="calculator">4_321 - 1_234</gadget>
<output>3_087</output>

<result>3_087</result>