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
#include<bits/stdc++.h>
using namespace std;

int main(){
    string x;
    cin >> x;
    cout << ( x=="ARC" ? "ABC" : "ARC");
    return 0;
}