import java.util.*;
class Main
{
    public static void main(String[] args)
    {
        
        Scanner sc = new Scanner(System.in);
        
        String a = sc.next();
        
        boolean flag =true;
        
        for(int i=0; i < a.length();i++) {
            char c = a.charAt(i);
            if(c=='U' || c=='D' ) continue;
            if(i%2 == 0 && c!='R') {
                System.out.println("No");
                flag=false;
                break;
            }
            else if (i%2!=0 && c!='L') {
                System.out.println("No");
                flag=false;
                break;
            }
        
        }
        if(flag){
            System.out.println("Yes");
            
        }
       
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz