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3953：I'll play a trick on you

题目描述
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.
输入解释
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<=10100)
输出解释
For each case, output the number of case and the third integer.(as shown in the sample output)
输入样例 
3
99 72
45 27
39 18
输出样例 
Case 1: 27
Case 2: 18
Case 3: 21
提示
If you have any idea to work out the ? and explain why but couldn't get Accepted , please email me (notonlysuccess@gmail.com), the first person will get 100RMB from me.
来自杭电HDUOJ的附加信息
Author NotOnlySuccess
Recommend lcy
该题目是Virtual Judge题目，来自 杭电HDUOJ
题目来源 2011 Alibaba Programming Contest
源链接： HDU-3953
最后修改于 2020-10-25T23:08:39+00:00 由爬虫自动更新
共提交 0 次
通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)