N = int(input())

S = input()

T = ""

while len(T) < N:
    if (T + "?a") in S:
        T += "?a"
    elif (T + "w?") in S:
        T += "w?"
    elif (T + "?o") in S:
        T += "?o"
    elif (T + "?") in S:
        T += "?"
    elif (T + "n") in S:
        T += "n"
    else:
        break

if T == S:
    print("Yes")
else:
    print("No")