static void Solve(Stdin io)
{
int d, n;
int[] l = io.Inputs();
d = l[0]; n = l[1];
if (n % 100 == 0)
{
n++;
}
WriteLine(n * (int)Math.Pow(10, 2 * d));
}
static void Main(string[] args)
{
Stdin io = new Stdin();
Solve(io);
}
static void Solve(Stdin io)
{
long x = io.Input();
WriteLine((x < 1200)?"ABC":"ARC");
}