n = int(input())
S = input()
dp = [0]*(n+1)
dp[0] = 1
l = ["wa","wo","n"]

for i in range(n):
    if dp[i] == 0:
        continue

    for x in l:
        if len(x) + i > n:
            continue
        ok = 1
        for j in range(len(x)):
            if x[j] == S[i+j] or S[i+j] == "?":
                ok = 1
            else:
                ok = 0
        if ok:
            dp[i+len(x)] = 1
    # print(dp)
print("Yes" if dp[-1] else "No")