Use 6 number cards, 4, 0, 7, 1, 3, 6 to form 2 three-digit numbers, what is the minimum difference.
用6张数卡，4，0，7，1，3，6摆成2个三位数，最小差是多少．
<gadget id="calculator">701 - 643</gadget>
<output>58</output>

<result>58</result>