s=input()
for i in range(len(s)):
  if i%2==0 and s[i]=='L':
    print('No')
    exit()
  elif i%2==1 and s[i]=='R':
    print('No')
    exit()
print('Yes')    s=input() s input() input for i in range(len(s)):
  if i%2==0 and s[i]=='L':
    print('No')
    exit()
  elif i%2==1 and s[i]=='R':
    print('No')
    exit() i range(len(s)) range len(s) len s if i%2==0 and s[i]=='L':
    print('No')
    exit()
  elif i%2==1 and s[i]=='R':
    print('No')
    exit() i%2==0 and s[i]=='L' i%2==0 i%2 i 2 0 s[i]=='L' s[i] s i 'L' print('No') print 'No' exit() exit elif i%2==1 and s[i]=='R':
    print('No')
    exit() i%2==1 and s[i]=='R' i%2==1 i%2 i 2 1 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 and s[i]=='L':
    print('No')
    exit()
  elif i%2==1 and s[i]=='R':
    print('No')
    exit()
print('Yes')   