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