import sys
input = sys.stdin.readline

N=int(input())
S=list(input().strip())

for i in range(len(S)):
    if S[i]=="o":
        S[i]=1
    else:
        S[i]=0

if N%2==1:
    if S.count(1)%2==1:
        print("No")
        exit()

print("Yes")

if N%2==0:
    A=[0]*N
    for i in range(0,N,2):
        A[i]=1


    ALL=0
    X=[0]*N

    for i in range(N):
        if A[i]!=S[i]:
            ALL+=1
            X[i]+=1

    for i in range(N):
        X[i]=(X[i]+ALL)%2

    ANS=[]

    for x in X:
        if x==0:
            ANS.append("L")
        else:
            ANS.append("R")

    print("".join(ANS))

else:
    ANS=[]
    for i in range(N):
        if S[i]==1:
            ANS.append("R")
        else:
            ANS.append("L")

    print("".join(ANS))