public class Main{
 
    public static class Parent {
 
        public int x(int i) { return i + 2; }
        public static String id() { return "P";}
        
    }
 
    public static class Child extends Parent {
        
        public int x(int i) { return i + 3; }
        public String x(String s) { return s + "R"; }
        public static String id() { return "C"; }
        
    }
 
    public static void main(String[] args) {
 
        Parent ref = new Child();
        System.out.println(ref.x(2) + ref.id());
        
    }
    
}