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

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

for i in range(1, N + 1):
    if S[i - 1] in ['n', '?']:
        dp[i] |= dp[i - 1]
    if i == 0:
        continue
    if (S[i - 2] in ['w', '?']) and (S[i - 1] in ['a', 'o', '?']):
        dp[i] |= dp[i - 2]

if dp[-1]:
    print("Yes")
else:
    print("No")