title: Count number of names starts with particular character in file
body: <p>i have the following file::</p>
  
  <pre><code>FirstName, FamilyName, Address, PhoneNo
  </code></pre>
  
  <p>the file is sorted according to the family name, how can i count the number of family names starts with a particular character ??</p>
  
  <p>output should look like this ::</p>
  
  <pre><code>A: 2
  B: 1
  ...
  </code></pre>
  
  <p>??</p>