text: const missingLetter = str => {
    for (let i = 1; i < str.length; i++) {
      if (str.charCodeAt(i-1) + 1 !== str.charCodeAt(i))
        return String.fromCharCode(str.charCodeAt(i-1) + 1);
    }
    return "No missing letter";
  };
  
  const str = "ghijklmno";
  
  document.getElementById('ans').textContent = missingLetter(str);