import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String num = new String(in.readLine());
        String[] numarray = num.split("");
        boolean flg = true;

        for(int i = 1; i < numarray.length + 1; i++){
        	if(i % 2 == 0){
        		if(numarray[i-1].equals("R")){
        			flg = false;
        			break;
        		}
        	}else{
        		if(numarray[i-1].equals("L")){
        			flg = false;
        			break;
        		}
        	}
        }
        if(flg){
        	System.out.println("Yes");
        }else{
        	System.out.println("No");
        }
	}
}
/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