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