ACM-I'll play a trick on you

描述

Please look the picture carefully. Then I'll give you two integers and your task is output the third one.
Please never doubt the picture.

输入

The first line is a number T(1<=T<=30), represents the number of case. The next T blocks follow each indicates a case.
Each case contains two integers A,B (1<=B<=A<=10^100)

输出

For each case, output the number of case and the third integer.

样例输入

399 7245 2739 18

样例输出

271821

代码：

01.#include<iostream>

02.#include<string>

03.usingnamespace std;

04.intmain()

05.{

06.intt;

07.cin>>t;

08.while(t--)

09.{

10.string a,b;

11.inti,sum=0;

12.cin>>a>>b;

13.for(i =0;i <a.length();i++)

14.sum += a[i] -'0';

15.for(i = 0;i < b.length();i++)

16.sum += b[i] -'0';

17.cout<<sum<<endl;

18.}

19.return0;

20.}