s=str(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=str(input()) s str(input()) str 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 ans="Yes" "Yes" ans ans="No" "No" ans s=str(input()) str(input()) s
s=str(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)