考试操纵 - Problem

#1366. 考试操纵

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This problem is prepared by xiaowuc1 .

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

一群学生正在参加一场判断题考试。每道题一分。作为老师，你希望你的学生表现得尽可能好——所以你作弊了！（我知道，你绝不会真的这么做。）为了作弊，你操纵了答案键，使得班级中的最低分尽可能高。

你能达到的最高最低分是多少？

输入格式

第一行包含两个整数 $n$ ($1 \le n \le 1,000$) 和 $k$ ($1 \le k \le 10$)，其中 $n$ 是学生人数，$k$ 是考试中判断题的数量。

接下来的 $n$ 行，每行包含一个长度为 $k$ 的字符串，仅由大写字母 'T' 和 'F' 组成。该字符串表示学生提交的答案，按题目给出的顺序排列。

输出格式

输出一行，表示班级中可能达到的最高最低分。

样例

输入 1

5 4
TFTF
TFFF
TFTT
TFFT
TFTF

输出 1

输入 2

3 5
TFTFT
TFTFT
TFTFT

输出 2

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