#include<stdio.h>
 
int main()
{
	char S[6];
	scanf("%s", &S);
	if(S[1] == 'B') printf("ARC\n");
	else printf("ABC\n");
	return 0;
}
### Prompt

Your task is to create 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<stdio.h>
 
int main()
{
	char S[6];
	scanf("%s", &S);
	if(S[1] == 'B') printf("ARC\n");
	else printf("ABC\n");
	return 0;
}
```