import java.util.Scanner;


public class Main {


//	final int MOD = 1000000007;

//	public static int max = 0;

	public static void main(String[] args) {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	}
} import java.util.Scanner; Scanner java.util public class Main {


//	final int MOD = 1000000007;

//	public static int max = 0;

	public static void main(String[] args) {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	}
} Main public static void main(String[] args) {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	} main {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	} int ans = 0; ans 0 Scanner sc = new Scanner(System.in); sc new Scanner(System.in) boolean f = false; f false String string = sc.next(); string sc.next() sc.next sc if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		} string.equals("ABC") string.equals string "ABC" {
			f = false;
		} f = false f false {
			f = true;
		} f = true f true if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		} f {
			System.out.println("ABC");
		} System.out.println("ABC") System.out.println System.out System System.out "ABC" {
			System.out.println("ARC");
		} System.out.println("ARC") System.out.println System.out System System.out "ARC" sc.close() sc.close sc String[] args args public class Main {


//	final int MOD = 1000000007;

//	public static int max = 0;

	public static void main(String[] args) {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	}
} public class Main {


//	final int MOD = 1000000007;

//	public static int max = 0;

	public static void main(String[] args) {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	}
} Main
import java.util.Scanner;


public class Main {


//	final int MOD = 1000000007;

//	public static int max = 0;

	public static void main(String[] args) {

		int ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

//		int n = sc.nextInt();
//		int m = sc.nextInt();
		String string = sc.next();

//		int[] ans = new int[n];

		//-------------------------------------------------------------------------------------

		if(string.equals("ABC") ) {
			f = false;
		} else {
			f = true;
		}

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

		if(f) {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

//		System.out.println(ans);

		sc.close();
	}
}