n = int(input())
s = input()

i = 0
while i < n:
    if s[i] == '?':
        if i + 1 < n and (s[i + 1] == 'a' or s[i + 1] == 'o'):
            i += 2
        else:
            i += 1
    elif s[i] == 'n':
        i += 1
    elif i + 1 < n and (s[i:i + 2] == 'wa' or s[i:i + 2] == 'wo' or s[i:i + 2] == 'w?'):
        i += 2
    else:
        print("No")
        exit()
print("Yes")