N = int(input())

S = input()

T = ""

lst = ["wa", "wo", "n", "?a", "w?", "?o", "?"]

while len(T) < N:
    judge = False
    for value in lst:
        if T + value == S[:len(T)+len(value)]:
            T += value
            judge = True
            break
    if judge == False:
        print("No")
        exit()

if T == S:
    print("Yes")