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

for i in range(N - 1):
    if S[i] == "w" and S[i + 1] == "?":
        S[i + 1] = "a"
    if S[i + 1] in "oa" and S[i] == "?":
        S[i] = "w"

T = "".join(S)
if len(T.replace("wa", "").replace("wo", "").replace("n", "").replace("?", "")):
    print("No")
else:
    print("Yes")