title: Number of non repeating lines - unique count
body: <p>Here is my problem: Any number of lines of text is given from standard input.
  Output: number of non repeating lines</p>
  
  <p><strong>INPUT:</strong></p>
  
  <pre><code>She is wearing black shoes.
  My name is Johny.
  I hate mondays.
  My name is Johny.
  I don't understand you.
  She is wearing black shoes.
  </code></pre>
  
  <p><strong>OUTPUT:</strong></p>
  
  <pre><code>2
  </code></pre>