s = input()
for i in range(len(s)):
  if i%2 == 0:
    if s[i] == "L":
      print("No")
      exit()
  elif s[i] == "R":
    print("No")
    exit()
print("Yes") s = input() s input() input for i in range(len(s)):
  if i%2 == 0:
    if s[i] == "L":
      print("No")
      exit()
  elif s[i] == "R":
    print("No")
    exit() i range(len(s)) range len(s) len s if i%2 == 0:
    if s[i] == "L":
      print("No")
      exit()
  elif s[i] == "R":
    print("No")
    exit() i%2 == 0 i%2 i 2 0 if s[i] == "L":
      print("No")
      exit()
   s[i] == "L" s[i] s i "L" print("No") print "No" exit() exit elif s[i] == "R":
    print("No")
    exit() s[i] == "R" s[i] s i "R" print("No") print "No" exit() exit print("Yes") print "Yes" s = input() input() s
s = input()
for i in range(len(s)):
  if i%2 == 0:
    if s[i] == "L":
      print("No")
      exit()
  elif s[i] == "R":
    print("No")
    exit()
print("Yes")