Column calculation: What is the sum of the difference between 15 plus 56 minus 34?
列式计算：15加上56减34的差，和是多少？
<gadget id="calculator">56 - 34</gadget>
<output>22</output>

<gadget id="calculator">15 + 22</gadget>
<output>37</output>

<result>37</result>