AT_abc463_b.Train Reservation

Takahashi is trying to reserve a seat on a train.

There are $N$ trains he is considering as candidates for reservation, numbered $1, 2, \dots, N$. Each train has seats in five columns, called column A, column B, column C, column D, and column E.

The current seat availability information for each train is given as strings $S_1, S_2, \dots, S_N$. Here, $S_1, S_2, \dots, S_N$ all have length $5$, and columns A through E of train $i$ correspond to the first through fifth characters of $S_i$, respectively. If that character is o, there is a vacant seat in the corresponding column; if it is x, there is no vacant seat in the corresponding column.

Takahashi wants to reserve a seat in column $X$, where $X$ is one of A, B, C, D, E. Determine whether there is a vacant seat in column $X$ on at least one train.

高桥正在尝试预订一列火车的座位。

他考虑了 $N$ 列候选火车，编号为 $1, 2, \dots, N$。每列火车的座位分为五列，分别称为 A 列、B 列、C 列、D 列和 E 列。

每列火车当前的座位可用信息以字符串 $S_1, S_2, \dots, S_N$ 给出。其中，$S_1, S_2, \dots, S_N$ 的长度均为 $5$，且第 $i$ 列火车的 A 至 E 列分别对应于字符串 $S_i$ 的第 $1$ 至第 $5$ 个字符。若该字符为 o，表示对应列有空座位；若为 x，则表示对应列无空座位。

高桥希望预订第 $X$ 列的座位，其中 $X$ 是 A、B、C、D、E 中的一个。请判断是否至少存在一列火车，在其第 $X$ 列中有空座位。

The input is given from Standard Input in the following format:

$N$ $X$
$S_1$
$S_2$
$\vdots$
$S_N$

输入从标准输入中按以下格式给出：

$N$ $X$
$S_1$
$S_2$
$\vdots$
$S_N$

If there is a vacant seat in column $X$ on at least one train, output Yes; otherwise, output No.

如果至少有一列火车在第 $X$ 列存在空座位，则输出 Yes；否则，输出 No。

Sample 1 Explanation:
Train $3$ has a vacant seat in column A. Thus, output Yes.

Sample 2 Explanation:
No train has a vacant seat in column C. Thus, output No.

Constraints

• $N$ is an integer between $1$ and $100$, inclusive.
• $X$ is one of A, B, C, D, E.
• $S_i$ is a string of length $5$ consisting of o and x.

样例 1 解释：
列车 3 的 A 列有一个空座位。因此，输出 Yes。

样例 2 解释：
没有任何列车的 C 列有空座位。因此，输出 No。

约束条件

• $N$ 是一个介于 $1$ 到 $100$（含）之间的整数。
• $X$ 是 A、B、C、D、E 中的一个字符。
• $S_i$ 是一个长度为 $5$ 的字符串，仅由字符 o 和 x 组成。