#include <stdio.h>
/*ABC
Smeke's current rating is less than 1200, thus the output should be ABC.
*/
int main ()
{
	int a=0;
	scanf("%d",&a);
	if(a<1200)
		{
			printf("ABC\n");
		
		}
	else if(a>=1200)
	{
		printf("ARC\n");
		
	}
	
	
	
	return 0;
}