title: What is needed to make the last else statement appear?
body: <p>If the user were to input random letters instead of a number, "that is not a number" should be the output. It instead puts out "they can not come in" what do I need to change? </p>
  
  <pre><code>print "how old are you? "
  age = gets.chomp.to_i
  
  if age &gt;= 21
    puts "They can come in"
  elsif age &lt; 21
    puts "they can not come in"
  else 
    puts "that is not a number"
  end
  </code></pre>