title: Find all cells, in a column of characters or strings, that match "a"
body: <p>How do I look through a column of characters or strings, and find all cells in said column that matches with "a" and then add a value from a cell in the same row to (E2) the sum?</p>
  
  <p>I have illustrated it in this picture:</p>
  
  <p><img src="https://i.stack.imgur.com/Tvb9B.png" alt="I have illustrated it in this picture"></p>