title: Display Country's name in Textbox
body: <p>Goal:<br>
  Display the name of countries in a list based on selection.
  For instance, if I select Australia and France, the country's name should display in the textbox.
  If I select (Select All), all the country's name shall be printed in the textbox.</p>
  
  <p>Problem:<br>
  I do not know how to do it. I can retrieve one country but not many countries.</p>
  
  <p><img src="https://i.stack.imgur.com/XaGz4.png" alt="enter image description here"></p>