Score : $150$ points

问题陈述

有三个兄弟，分别叫做 A、B 和 C。他们之间的年龄关系由三个字符 $S_{\mathrm{AB}}$、$S_{\mathrm{AC}}$ 和 $S_{\mathrm{BC}}$ 表示，具体含义如下：

• 如果 $S_{\mathrm{AB}}$ 是 <，则表示 $A$ 比 $B$ 年轻；如果是 >，则表示 $A$ 比 $B$ 年长。
• 如果 $S_{\mathrm{AC}}$ 是 <，则表示 $A$ 比 $C$ 年轻；如果是 >，则表示 $A$ 比 $C$ 年长。
• 如果 $S_{\mathrm{BC}}$ 是 <，则表示 $B$ 比 $C$ 年轻；如果是 >，则表示 $B$ 比 $C$ 年长。

谁是中间的兄弟，即他们三个中第二年长的？

以上为大语言模型 kimi 翻译，仅供参考。

Problem Statement

There are three brothers named A, B, and C. The age relationships among them are given by three characters $S_{\mathrm{AB}}, S_{\mathrm{AC}}, S_{\mathrm{BC}}$, which mean the following:

• If $S_{\mathrm{AB}}$ is <, then $A$ is younger than $B$; if it is >, then $A$ is older than $B$.
• If $S_{\mathrm{AC}}$ is <, then $A$ is younger than $C$; if it is >, then $A$ is older than $C$.
• If $S_{\mathrm{BC}}$ is <, then $B$ is younger than $C$; if it is >, then $B$ is older than $C$.

Who is the middle brother, that is, the second oldest among the three?

Constraints

• Each of $S_{\mathrm{AB}}, S_{\mathrm{AC}}, S_{\mathrm{BC}}$ is < or >.
• The input contains no contradictions; that is, there always exists an age relationship that satisfies all given inequalities.

Input

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

$S_{\mathrm{AB}}$ $S_{\mathrm{AC}}$ $S_{\mathrm{BC}}$

Output

Print the name of the middle brother, that is, the second oldest among the three.

Sample Input 1

< < <

Sample Output 1

B

Since $A$ is younger than $B$, and $B$ is younger than $C$, we can determine that $C$ is the oldest, $B$ is the middle, and $A$ is the youngest. Hence, the answer is B.

Sample Input 2

< < >

Sample Output 2

C