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

while True:
    if len(s) == 0:
        print('Yes')
        exit()
    if len(s) == 1:
        if s[0] == 'n' or s[0] == '?':
            print('Yes')
            exit()
        else:
            print('No')
            exit()

    else:
        f = 0
        if len(s) > 2 and s[-1] =='?' and s[-2] == '?' and s[-3] =='w':
            s.pop()
            s.pop()
            s.pop()
            f =1
        elif s[-1] == 'n':
            s.pop()
            f = 1
        elif (s[-1] == 'o' or s[-1] == '?') and (s[-2] == 'w' or s[-2] == '?'):
            s.pop()
            s.pop()
            f = 1
        elif (s[-1] == 'a' or s[-1] == '?') and (s[-2] == 'w' or s[-2] == '?'):
            s.pop()
            s.pop()
            f = 1

        elif s[-1] == '?':
            s.pop()
            f = 1
        if f == 0:
            print('No')
            exit()