n = int(input())
s = input()


i = 0

while i < n:
    if (
        i + 1 < n
        and s[i] in {"?", "w"}
        and s[i + 1] in {"?", "a", "o"}
        and s[i] != s[i + 1]
    ):
        i += 2
    elif s[i] in {"n", "?"}:
        i += 1
    else:
        # print(i, s[i], s[i + 1])
        print("No")
        exit()
print("Yes")