#include <iostream>
#include <string>
 
int main(){
	std::string s;
	std::cin>>s;
  	std::cout<<(s=="ABC"?"ARC":"ABC");
	return 0;
}
### Prompt

Generate a cpp solution to the following problem:

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

### Response

```cpp
#include <iostream>
#include <string>
 
int main(){
	std::string s;
	std::cin>>s;
  	std::cout<<(s=="ABC"?"ARC":"ABC");
	return 0;
}
```