def main():
    n = int(input())
    S = input()
    Ans = [1] * n
    for i in range(n-1):
        if S[i] != S[i+1]:
            Ans[i+1] = Ans[i]
        else:
            Ans[i+1] = Ans[i]^1
    x = 1 if S[-1] == "o" else 0
    if sum(Ans[:-1]) % 2 == x:
        return "".join(["LR"[ans] for ans in Ans])
    x = 1 if S[0] == "o" else 0
    if (n-sum(Ans[1:])) % 2 == x:
        return "".join(["RL"[ans] for ans in Ans])
    return ""

ans = main()
if ans:
    print("Yes")
    print(ans)
else:
    print("No")