#!/usr/bin/env python3
import sys
from bisect import bisect_left, bisect_right, insort_left, insort_right  # type: ignore
from collections import Counter, defaultdict, deque  # type: ignore
from math import gcd, sqrt, ceil  # type: ignore
from heapq import heapify, heappop, heappush, heappushpop, heapreplace, merge  # type: ignore
from itertools import accumulate, combinations, permutations, product  # type: ignore
from string import ascii_lowercase, ascii_uppercase # type: ignore

def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode("utf-8").split()
def S(): return sys.stdin.buffer.readline().rstrip().decode("utf-8")
def IR(n): return [I() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def SR(n): return [S() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
def SRL(n): return [list(S()) for _ in range(n)]

N = I()
l = list(S())
while l:
    n = len(l)
    if l[-1]=='n':
        l.pop()
    elif l[-1] in 'ao':
        if n>1 and l[-2] in ('?w'):
            l.pop()
            l.pop()
        else:
            break
    elif l[-1]=='?':
        if n>1 and l[-2]=='w':
            l.pop()
            l.pop()
        else:
            l.pop()
    else:
        break
print('Yes' if not l else 'No')