CF656G.You're a Professional

A simple recommendation system would recommend a user things liked by a certain number of their friends. In this problem you will implement part of such a system.

You are given user's friends' opinions about a list of items. You are also given a threshold T — the minimal number of "likes" necessary for an item to be recommended to the user.

Output the number of items in the list liked by at least T of user's friends.

一个简单的推荐系统会向用户推荐其若干好友喜欢的物品。在本题中，你将实现此类系统的一部分。

你将获得该用户的好友对一系列物品的评价。同时，你还会获得一个阈值 $T$ —— 一个物品被推荐给该用户所需的最少“喜欢”次数。

请输出列表中被该用户至少 $T$ 位好友喜欢的物品数量。

The first line of the input will contain three space-separated integers: the number of friends F (1 ≤ F ≤ 10), the number of items I (1 ≤ I ≤ 10) and the threshold T (1 ≤ T ≤ F).

The following F lines of input contain user's friends' opinions. j-th character of i-th line is 'Y' if i-th friend likes j-th item, and 'N' otherwise.

输入的第一行包含三个用空格分隔的整数：朋友数量 $F$（$1 \leq F \leq 10$）、物品数量 $I$（$1 \leq I \leq 10$）以及阈值 $T$（$1 \leq T \leq F$）。

接下来的 $F$ 行输入表示各位朋友的意见。第 $i$ 行的第 $j$ 个字符为 'Y' 表示第 $i$ 位朋友喜欢第 $j$ 个物品，否则为 'N'。

Output an integer — the number of items liked by at least T of user's friends.

输出一个整数——被该用户至少 T 个朋友点赞的物品数量。