N=int(input())
S=input()
D={}
for i in range(N):
  if S[i]=='?' or S[i]=='n':
    if i not in D:
      D[i]=[]
    D[i].append(i+1)

for i in range(N-1):
  a=S[i:i+2]
  if a=='wa' or a=='wo' or a=='w?' or a=='?o' or a=='?a' or a=='??':
    if i not in D:
      D[i]=[]
    D[i].append(i+2)
dp=[-1]*(N+1)
dp[0]=1
for i in range(N):
  if i in D and dp[i]==1:
    for nex in D[i]:
      dp[nex]=1
if dp[-1]==1:
  print('Yes')
else:
  print('No')