There are three integers A, B, and C, the sum of the digits of A is 11, the sum of the digits of B is 12, and the sum of the digits of C is 13, and the addition of the three numbers carries three times, then A+ What is the sum of the digits of B+C?
有A、B、C三个整数，A的各位数字之和为11，B的各位数字之和为12，C的各位数字之和为13，且三个数相加时进位三次，那么A+B+C的各位数字之和为多少．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">13 - 27</gadget>
<output>-14</output>

<gadget id="calculator">11 + 12 + (-14)</gadget>
<output>9</output>

<result>9</result>