lines = readlines.map(&:chomp)
N = lines[0].to_i
S = lines[1]

dp = Array.new(N) { Array.new(26, false) }
if S[0] == '?'
  26.times { |j| dp[0][j] = true }
end
if S[0] == 'n'
  dp[0][13] = true
end
if S[0] == 'w'
  dp[0][22] = true
end
if S[0] == 'a' || S[0] == 'o'
  puts "No"
  exit
end

dp_i = dp[0]
1.upto(N - 1) do |i|
  dp_i1 = dp[i - 1]
  dp_i = dp[i]
  0.upto(25) do |j|
    if dp_i1[j]
      if j == 22
        if S[i] == 'a'
          dp_i[0] = true
        end
        if S[i] == 'o'
          dp_i[14] = true
        end
        if S[i] == '?'
          dp_i[0] = true
          dp_i[14] = true
        end
      else
        if S[i] == 'w'
          dp_i[22] = true
        end
        if S[i] == 'n'
          dp_i[13] = true
        end
        if S[i] == '?'
          dp_i[22] = true
          dp_i[13] = true
        end
      end
    end
  end
end

ans = dp[N - 1][0] || dp[N - 1][14] || dp[N - 1][13]

if ans
  puts "Yes"
else
  puts "No"
end