UVA12716 GCD等于XOR GCD XOR
Description
[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=823&page=show_problem&problem=4454
[PDF](https://uva.onlinejudge.org/external/127/p12716.pdf)

Input Format
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Output Format
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