AOJ 3831 - I'll play a trick on you

I'll play a trick on you

Time Limit: 1000ms

Memory Limit: 32768KB

This problem will be judged on HDU. Original ID: 3953
64-bit integer IO format: %I64d Java class name: Main

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Description

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.

Input

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)

Output

For each case, output the number of case and the third integer.(as shown in the sample output)

Sample Input

Sample Output

Case 1: 27
Case 2: 18
Case 3: 21

Source

2011 Alibaba Programming Contest