import java.io.*;
import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    
    for (int i = 0; i < S.length(); i++) {
      if ((S.charAt(i) == 'R' && (i+1) % 2 == 0)
      || (S.charAt(i) == 'L' && (i+1) % 2 != 0)
      ) {
        System.out.println("No");
        return;
      } else {
        continue;
      }
    }
    
    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