dom Order The Names

function solve(){
  let input = document.querySelector('input');
  let list = document.querySelectorAll('li');

  document.querySelector("button").addEventListener('click',regUser);

  function regUser(){
     if(input.value === ''){
        return;
     }

     const name = input.value[0].toUpperCase() + input.value.slice(1).toLowerCase();
     const position = name.charCodeAt(0) - 65;
     const people = list[position].textContent.split(', ').filter(Boolean);

     people.push(name);
     list[position].textContent = people.join(', ');
     input.value = '';
  }

}