import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

N = int(input())
s = "x" + input().rstrip()
dp = [0]*(N+1)
dp[0] = 1
wa = "wa"
wo = "wo"
n = "n"
x = set(["wa","?a","w?","wo","w?", "?o", "??"])
for i in range(1, N+1):
    si = s[i]
    if si == "?" or si == n:
        dp[i] |= dp[i-1]
    if i >= 2:
        pre = s[i-1]
        w = pre + si
        if pre + si in x:
            dp[i] |= dp[i-2]
print('Yes') if dp[-1] else print('No')