<a href="https://www.spoj.com/problems/LCA/">https://www.spoj.com/problems/LCA/</a>
Input Format
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Output Format
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Constraints
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Notice
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Example
Input
1 7 3 2 3 4 0 3 5 6 7 0 0 0 0 2 5 7 2 7
Output
Case 1: 3 1