title: using grep -E to find peoples last names that begin with S but not include them is their first names begin with S
body: <p>Find people whose last name begins with S in the people.txt file (Your expression should
  match the entire last name, not just the initial S, and only capital S qualifies). Ensure that
  the first names that begin with S are not included.</p>
  
  <p>the people.txt includes bellow:</p>
  
  <pre><code>Cardoza, Fred
  Catto, Philipa
  Duncan, Jean
  Edwards, Neil
  England, Elizabeth
  Main, Robert
  Martin, Jane
  Meens, Carol
  Patrick, Harry
  Paul, Jeanine
  Roberts, Clementine
  Schmidt, Paul
  Sells, Simon
  Smith, Peter
  Stephens, Sheila
  Wales, Gareth
  Zinni, Hamish
  </code></pre>
  
  <p>answer should be:</p>
  
  <pre><code>Schmidt, Paul
  Smith, Peter
  </code></pre>
  
  <p>my answer currently includes:</p>
  
  <pre><code>Schmidt, Paul
  Sells, Simon
  Smith, Peter
  Stephens, Sheila
  </code></pre>
  
  <p>pls elp me</p>