[HackerEarth] Kira, is dreaming of building a new world, where all expressions will be special sequences. All these sequences consists of characters 'A','a','B','b','C','c'. - 题解

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题目信息
题号 P17725
标题 [HackerEarth] Kira, is dreaming of building a new world, where all expressions will be special sequences. All these sequences consists of characters 'A','a','B','b','C','c'.
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