import java.util.*;
import java.io.*;

 public class Main{
// taking inputs
static BufferedReader s1;
static BufferedWriter out;
static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;}
static int int_v (String s1){return Integer.parseInt(s1);}
static long long_v(String s1){return Long.parseLong(s1);}
static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;}
static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;}
static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));}

//......................................@uthor_Alx..............................................


   public static void main(String[] args) throws  IOException{
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	}
}
	       
	          



	
  


 import java.util.*; util.* java import java.io.*; io.* java public class Main{
// taking inputs
static BufferedReader s1;
static BufferedWriter out;
static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;}
static int int_v (String s1){return Integer.parseInt(s1);}
static long long_v(String s1){return Long.parseLong(s1);}
static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;}
static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;}
static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));}

//......................................@uthor_Alx..............................................


   public static void main(String[] args) throws  IOException{
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	}
} Main // taking inputs
static BufferedReader s1; s1 static BufferedWriter out; out static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;} read {String line="";while(line.length()==0){line=s1.readLine();continue;}return line;} String line=""; line "" while(line.length()==0){line=s1.readLine();continue;} line.length()==0 line.length() line.length line 0 {line=s1.readLine();continue;} line=s1.readLine() line s1.readLine() s1.readLine s1 continue; return line; line static int int_v (String s1){return Integer.parseInt(s1);} int_v {return Integer.parseInt(s1);} return Integer.parseInt(s1); Integer.parseInt(s1) Integer.parseInt Integer s1 String s1 s1 static long long_v(String s1){return Long.parseLong(s1);} long_v {return Long.parseLong(s1);} return Long.parseLong(s1); Long.parseLong(s1) Long.parseLong Long s1 String s1 s1 static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;} int_arr {String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;} String[] a=read().split(" "); a read().split(" ") read().split read() read " " int[] b=new int[a.length]; b new int[a.length] a.length a a.length for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);} int i=0; int i=0; i 0 i<a.length i a.length a a.length i++ i++ i {b[i]=int_v(a[i]);} {b[i]=int_v(a[i]);} b[i]=int_v(a[i]) b[i] b i int_v(a[i]) int_v a[i] a i return b; b static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;} long_arr {String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;} String[] a=read().split(" "); a read().split(" ") read().split read() read " " long[] b=new long[a.length]; b new long[a.length] a.length a a.length for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);} int i=0; int i=0; i 0 i<a.length i a.length a a.length i++ i++ i {b[i]=long_v(a[i]);} {b[i]=long_v(a[i]);} b[i]=long_v(a[i]) b[i] b i long_v(a[i]) long_v a[i] a i return b; b static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));} assign {s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));} s1=new BufferedReader(new InputStreamReader(System.in)) s1 new BufferedReader(new InputStreamReader(System.in)) out=new BufferedWriter(new OutputStreamWriter(System.out)) out new BufferedWriter(new OutputStreamWriter(System.out)) public static void main(String[] args) throws  IOException{
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	} main {
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	} assign() assign String s=read(); s read() read if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");} s.equals("ABC") s.equals s "ABC" {out.write("ARC");} out.write("ARC") out.write out "ARC" {out.write("ABC");} out.write("ABC") out.write out "ABC" out.flush() out.flush out String[] args args public class Main{
// taking inputs
static BufferedReader s1;
static BufferedWriter out;
static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;}
static int int_v (String s1){return Integer.parseInt(s1);}
static long long_v(String s1){return Long.parseLong(s1);}
static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;}
static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;}
static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));}

//......................................@uthor_Alx..............................................


   public static void main(String[] args) throws  IOException{
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	}
} public class Main{
// taking inputs
static BufferedReader s1;
static BufferedWriter out;
static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;}
static int int_v (String s1){return Integer.parseInt(s1);}
static long long_v(String s1){return Long.parseLong(s1);}
static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;}
static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;}
static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));}

//......................................@uthor_Alx..............................................


   public static void main(String[] args) throws  IOException{
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	}
} Main
import java.util.*;
import java.io.*;

 public class Main{
// taking inputs
static BufferedReader s1;
static BufferedWriter out;
static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;}
static int int_v (String s1){return Integer.parseInt(s1);}
static long long_v(String s1){return Long.parseLong(s1);}
static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;}
static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;}
static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));}

//......................................@uthor_Alx..............................................


   public static void main(String[] args) throws  IOException{
	        		  assign();
	        		  //aint n=int_v(read());
	        		  String s=read();
	        		  if(s.equals("ABC")){out.write("ARC");}
	        		  else{out.write("ABC");}
	        	
	        		// if(n[0]>0){out.write("Yes");}
	        		 //else{out.write("No");}
                      out.flush();
	        		 
	}
}
	       
	          



	
  



