def solve(N, S):
    candidate = ["wa", "wo", "n"]
    while True:
        if len(S) == 0:
            break
        if S[0] == '?' and len(S) == 1:
            S = []
            break
        if S[0] == '?' and S[1] == '?':
            S = S[1:]
            continue
        match = False
        for cc in candidate:
            match = True
            for i in range(len(cc)):
                if S[i] != '?' and S[i] != cc[i]:
                    match = False
                    break
            if match:
                S = S[len(cc):]
                break
        if not match:
            break
    if len(S) == 0:
        print("Yes")
    else:
        print("No")
N = int(input())
S = input()
solve(N, S)