XY and ZW represent a two-digit number respectively. If XY+ZW=139, then X+Y+Z+W=how much.
XY、ZW分别表示一个两位数，若XY+ZW=139，那么X+Y+Z+W=多少．
<gadget id="calculator">9 + 13</gadget>
<output>22</output>

<result>22</result>