#include<iostream>
using namespace std;
int main(){
	string temp;
	cin>>temp;
	if(temp=="ABC"){
		cout<<"ARC";
	}
	else{
		cout<<"ABC";
	}
} 
### 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>
using namespace std;
int main(){
	string temp;
	cin>>temp;
	if(temp=="ABC"){
		cout<<"ARC";
	}
	else{
		cout<<"ABC";
	}
} 
```