'''
Yuki 2373
wa, wo, n

????a
?????a
の時に変な所で切らないで行けるか?
先に変換できるところを変換する
w? -> wa
?a -> wa
?o -> wo
? -> n
'''


N = int(input())
S = input()
i = 0
OK1 = {"n","?"}
OK2 = {"wa","wo","?a","?o","w?",}
while i < N:
    if i == N - 1:
        if S[i] in OK1:
            i += 1
            continue
        else:
            print("No")
            exit()
    if S[i:i+2] in OK2:
        i += 2
    elif S[i] in OK1:
        i += 1
    else:
        print("No")
        exit()
print("Yes")