const readline = require('readline');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

rl.on('line', (line) => {
  const N = parseInt(line);
  
  rl.on('line', (line) => {
    const S = line.trim();
    
    const dp = new Array(N).fill(false).map(() => new Array(26).fill(false));
    if (S[0] === '?') {
      for (let j = 0; j < 26; j++) {
        dp[0][j] = true;
      }
    }
    if (S[0] === 'n') {
      dp[0]['n'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
    }
    if (S[0] === 'w') {
      dp[0]['w'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
    }
    if (S[0] === 'a' || S[0] === 'o') {
      console.log("No");
      process.exit(0);
    }

    for (let i = 1; i < N; i++) {
      for (let j = 0; j < 26; j++) {
        if (dp[i - 1][j] === true) {
          if (j === 'w'.charCodeAt(0) - 'a'.charCodeAt(0)) {
            if (S[i] === 'a') dp[i]['a'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
            if (S[i] === 'o') dp[i]['o'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
            if (S[i] === '?') {
              dp[i]['a'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
              dp[i]['o'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
            }
          } else {
            if (S[i] === 'w') dp[i]['w'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
            if (S[i] === 'n') dp[i]['n'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
            if (S[i] === '?') {
              dp[i]['w'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
              dp[i]['n'.charCodeAt(0) - 'a'.charCodeAt(0)] = true;
            }
          }
        }
      }
    }

    let ans = false;
    if (dp[N - 1]['a'.charCodeAt(0) - 'a'.charCodeAt(0)]) ans = true;
    if (dp[N - 1]['o'.charCodeAt(0) - 'a'.charCodeAt(0)]) ans = true;
    if (dp[N - 1]['n'.charCodeAt(0) - 'a'.charCodeAt(0)]) ans = true;

    if (ans === true) console.log("Yes");
    else console.log("No");

    process.exit(0);
  });
});