n = int(input())
S = input()
dp = [False] * (n + 1)
dp[0] = True
for i in range(n):
    if S[i] in "n?":
        dp[i + 1] |= dp[i]
    if i >= 1 and (S[i - 1 : i + 1] in ["wa", "wo", "?a", "?o", "w?", "??"]):
        dp[i + 1] |= dp[i - 1]
if dp[-1]:
    print("Yes")
else:
    print("No")