JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="fake_input" placeholder="Input here" />
<div id="result"></div>

JavaScript

function is_char(e){
  return (!e.ctrlKey && !e.altKey && !e.metaKey &&
                        (e.keyCode >= 65 && e.keyCode <= 90) || 
                        (e.keyCode >= 97 && e.keyCode <= 122)
                );
}
$('#fake_input').on('keyup', function(e){
  if (is_char(e)){
    $('#result').append(this.value[this.value.length - 1] + '<br />');
  }
}).focus();;