p02687 AtCoder Beginner Contest 166 - A?C
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.

Example

Input

ABC


Output

ARC
```python
s = str(input())
print("ARC" if s == "ABC" else "ABC") 
```