title: Removing text infant of an observation in R
body: <p>I have a Variable which looks like this </p>
  
  <pre><code>    ZIPCODE
      1
      2
      3
      NYC 4
      NYC 5
      NYC 6
  </code></pre>
  
  <p>I want to remove only the NYC in front of my observation and only keep the number behind it, without changing the observations without the NYC in front. Is there a way which allows me to do this?</p>