title: Remove n characters from a start of a string
body: <p>I want to remove the first characters from a string. Is there a function that works like this?</p>
  
  <pre><code>&gt;&gt;&gt; a = "BarackObama"
  &gt;&gt;&gt; print myfunction(4,a)
  ckObama
  &gt;&gt;&gt; b = "The world is mine"
  &gt;&gt;&gt; print myfunction(6,b)
  rld is mine
  </code></pre>