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

i = 0

while i <= n-1:
    if s[i] == "w":
        if i == n-1:
            print("No")
            exit()
        if s[i+1] == "a" or s[i+1] == "o":
            i += 2
        elif s[i+1] == "?":
            i += 2
        else:
            print("No")
            exit()
    elif s[i] == "n":
        i += 1
    elif s[i] == "?":
        if i == n-1:
            i += 1
        else:
            if s[i+1] == "a" or s[i+1] == "o":
                i += 2
            else:
                i += 1
    else:
        print("No")
        exit()
        
    #print(i)
        
print("Yes")