#include<cstdio>  
#include<iostream>  
#include<algorithm>  
#include<cstdlib>  
#include<cstring>
#include<string>
#include<climits>
#include<vector>
#include<cmath>
#define LL long long

using namespace std;

inline char nc(){
  static char buf[100000],*p1=buf,*p2=buf;
  if (p1==p2) { p2=(p1=buf)+fread(buf,1,100000,stdin); if (p1==p2) return EOF; }
  return *p1++;
}

inline void read(int &x){
  char c=nc(),b=1;
  for (;!(c>='0' && c<='9');c=nc()) if (c=='-') b=-1;
  for (x=0;c>='0' && c<='9';x=x*10+c-'0',c=nc()); x*=b;
}

inline void read(LL &x){
  char c=nc(),b=1;
  for (;!(c>='0' && c<='9');c=nc()) if (c=='-') b=-1;
  for (x=0;c>='0' && c<='9';x=x*10+c-'0',c=nc()); x*=b;
}

int wt,ss[19];
inline void print(int x){
	if (x<0) x=-x,putchar('-'); 
	if (!x) putchar(48); else {for (wt=0;x;ss[++wt]=x%10,x/=10);for (;wt;putchar(ss[wt]+48),wt--);}
}
inline void print(LL x){
	if (x<0) x=-x,putchar('-');
	if (!x) putchar(48); else {for (wt=0;x;ss[++wt]=x%10,x/=10);for (;wt;putchar(ss[wt]+48),wt--);}
}

int n,m;

int main()
{
	read(n);
	if (n<1200) puts("ABC");
	else puts("ARC");
	return 0;
}