N = int(input())
S = input()
l = ''
for c in S:
    if c == 'w':
        if l == '' or l == '?':
            l = 'w'
        else:
            break
    elif c == 'n':
        if l == '' or l == '?':
            l = ''
    elif c == '?':
        if l == '' or l == '?':
            l = '?'
        elif l=='w':
            l=''
    elif c == 'a' or c == 'o':
        if l == 'w' or l == '?':
            l = ''
        else:
            break
    else:
        break
else:
    if l != 'w':
        print('Yes')
        exit(0)
print('No')