Teacher Li is 18 years older than Teacher Zhang. Interestingly, if the age of Teacher Li is reversed, it happens to be the age of Teacher Zhang. What is the minimum sum of the ages of Teacher Li and Teacher Zhang? (Note: Teachers are all over 20 years old)
李老师比张老师大18岁，有意思的是，如果把李老师的年龄颠倒过来正好是张老师的年龄，求李老师和张老师的年龄和最少是几？(注：老师年龄都在20岁以上)
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">24 + 42</gadget>
<output>66</output>

<result>66</result>