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