s = input()
for i in s[::2]:
    if i == 'L':
        print("No")
        exit()
for i in s[1::2]:
    if i == 'R':
        print("No")
        exit()
print("Yes") s = input() s input() input for i in s[::2]:
    if i == 'L':
        print("No")
        exit() i s[::2] s ::2 2 if i == 'L':
        print("No")
        exit() i == 'L' i 'L' print("No") print "No" exit() exit for i in s[1::2]:
    if i == 'R':
        print("No")
        exit() i s[1::2] s 1::2 1 2 if i == 'R':
        print("No")
        exit() i == 'R' i 'R' print("No") print "No" exit() exit print("Yes") print "Yes" s = input() input() s
s = input()
for i in s[::2]:
    if i == 'L':
        print("No")
        exit()
for i in s[1::2]:
    if i == 'R':
        print("No")
        exit()
print("Yes")
