Contest Duration: - (local time) (100 minutes) Back to Home
A - A?C /

Time Limit: 2 sec / Memory Limit: 1024 MB

### 問題文

AtCoder 社は、毎週土曜日にコンテストを開催しています。

コンテストには ABC と ARC の 2 つの種類があり、毎週どちらか一方が開催されます。

ABC が開催された次の週には ARC が開催され、ARC が行われた次の週には ABC が開催されます。

### 制約

• SABC または ARC

### 入力

S


### 入力例 1

ABC


### 出力例 1

ARC


Score : 100 points

### Problem Statement

AtCoder Inc. holds a contest every Saturday.

There are two types of contests called ABC and ARC, and just one of them is held at a time.

The company holds these two types of contests alternately: an ARC follows an ABC and vice versa.

Given a string S representing the type of the contest held last week, print the string representing the type of the contest held this week.

### Constraints

• S is ABC or ARC.

### Input

Input is given from Standard Input in the following format:

S


### Output

Print the string representing the type of the contest held this week.

### Sample Input 1

ABC


### Sample Output 1

ARC


They held an ABC last week, so they will hold an ARC this week.