import java.util.*;

class Main{
	public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String str = sc.next();
    // /*
    for(int i=0;i<str.length();i++){
      if(i%2!=0){
        //System.out.println("Even");
        //System.out.println(str.charAt(i));
        if(str.charAt(i)!='L' && str.charAt(i)!='U' && str.charAt(i)!='D'){
          System.out.println("No");
          System.exit(0);
        }
      }
      else {
        //System.out.println("Odd");
        //System.out.println(str.charAt(i));
        if(str.charAt(i)!='R' && str.charAt(i)!='U' && str.charAt(i)!='D'){
          System.out.println("No");
          System.exit(0);
        }
      }
    }
    // */
    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