n=int(input())
s=input()
Ans=["L"]
def r(q):
    if q=="L":
        return "R"
    else:
        return "L"
def ok(a):
    L=[0]*n
    R=[0]*n
    for i in range(n):
        if a[i]=="L":
            L[i]=1
        else:
            R[i]=1
    for i in range(1,n):
        R[i]+=R[i-1]
    for i in reversed(range(n-1)):
        L[i]+=L[i+1]
    for i in range(n):
        R[i]+=L[i]
        R[i]%=2
    for i in range(n):
        if int(s[i]=="o")==R[i]:
            return False
    return True
for i in range(n-1):
    if s[i]!=s[i+1]:
        Ans.append(Ans[-1])
    else:
        Ans.append(r(Ans[-1]))
        
ans="".join(Ans)
if ok(ans):
    print("Yes")
    print(ans)
    exit()

Ans=["R"]
for i in range(n-1):
    if s[i]!=s[i+1]:
        Ans.append(Ans[-1])
    else:
        Ans.append(r(Ans[-1]))
ans="".join(Ans)
if ok(ans):
    print("Yes")
    print(ans)
    exit()
print("No")