title: Find index of element in list in Scheme
body: <p>I'm new to Scheme, and I don't know where to start with this. I want to write a Scheme function, which takes two parameters, a list <code>lst</code> and an atom <code>atm</code>, and returns the index of the first location where <code>atm</code> occurs in the list.  The location index is 1-relative. If <code>atm</code> does not occur in the list, the function returns <code>n + 1</code>, where <code>n</code> is the length of the list.</p>
  
  <p>How can I do this?</p>