s = input()

ans = "Yes"

for i in range(len(s)):
    if i % 2 == 0:
        if s[i] == "L":
            ans = "No"
    else:
        if s[i] == "R":
            ans = "No"

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

ans = "Yes"

for i in range(len(s)):
    if i % 2 == 0:
        if s[i] == "L":
            ans = "No"
    else:
        if s[i] == "R":
            ans = "No"

print(ans)