from collections import Counter
from re import compile


def main():
    N = int(input())
    S = input()
    ctr = Counter(S)
    if len(S) > ctr["w"] + ctr["a"] + ctr["o"] + ctr["n"] + ctr["?"]:
        print("No")
        return

    idx = 0
    while idx < N:
        if idx == N - 1:
            if S[idx] in ("?", "n"):
                print("Yes")
            else:
                print("No")
            return

        if idx == N - 2:
            if S[idx] == "w":
                if S[idx + 1] in ("a", "o", "?"):
                    print("Yes")
                else:
                    print("No")
                return
            if S[idx] in ("a", "o"):
                print("No")
                return
            if S[idx] == "n":
                if S[idx + 1] in ("n", "?"):
                    print("Yes")
                else:
                    print("No")
                return
            if S[idx] == "?":
                if S[idx + 1] == "w":
                    print("No")
                else:
                    print("Yes")
                return

        l_1, l_2, l_3 = S[idx:idx + 3]
        if l_1 in ("a", "o"):
            print("No")
            return
        if l_1 == "n":
            idx += 1
            continue
        if l_1 == "w":
            if l_2 in ("a", "o", "?"):
                idx += 2
                continue
            print("No")
            return
        if l_1 == "?":
            if l_2 == "w":
                print("No")
                return
            if l_2 != "?":
                idx += 2
                continue
            if l_3 == "w":
                idx += 2
                continue
            if l_3 in ("a", "o", "n"):
                idx += 3
                continue
            idx += 1


if __name__ == "__main__":
    main()