s=input()

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