n=int(input())
s=list(input())
for i in range(n-1):
 if s[i] == 'w' and s[i + 1] == '?':
  s[i+1] = 'a'
 if s[i+1] in 'oa' and s[i]=='?':
  s[i]='w'
t=''.join(s)
if len(t.replace('wa','').replace('wo','').replace('n','').replace('?','')):
 print('No')
else:
 print('Yes')