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

dp = [False] * (N + 1)
dp[0] = True

for i in range(N):
    if S[i] == 'w' or S[i] == '?':
        if i + 2 <= N and (S[i + 1] == 'a' or S[i + 1] == 'o' or S[i + 1] == '?'):
            dp[i + 2] |= dp[i]
    if S[i] == 'n' or S[i] == '?':
        dp[i + 1] |= dp[i]

print('Yes' if dp[N] else 'No')