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統計

この問題は以下のコンテストで使用されています：

The 2023 ICPC Taiwan Online Programming Contest

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

给你一个由小写英文字母组成的字符串 $s$。一个 “kick” 被定义为 $s$ 的一个子串，它以字母 ‘k’ 开头，后跟字母 ‘i’，再后跟字母 ‘c’，最后跟字母 ‘k’。

你的任务是计算字符串 $s$ 中不同的 “kick” 的数量。请注意，“kick” 之间可以重叠。

输入格式

输入仅包含一个由小写英文字母组成的字符串 $s$。

输出格式

在一行中输出 “kick” 的数量。

数据范围

字符串 $s$ 的长度不超过 $5 \times 10^6$。

样例

输入样例 1

kickickstartkicks

输出样例 1

输入样例 2

kickkickkickkick

输出样例 2

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