s=str(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=str(input()) s str(input()) str 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=str(input()) str(input()) s
s=str(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")