title: New input after giving a wrong input
body: <pre><code>a = input()   
  def word_to_list(a):
          b = str(a)
          code2 = []
          for digit in b:
              code2.append (int(digit))
          if len(code2) != 4:
              print("no right amount")
          else:
              print(code2)
  code2 = word_to_list(a)
  </code></pre>
  
  <p>I got this code and what I want is that you can do another try when the code is to short, (because you need a length of 4). Does somebody know how that works, so that you can do a new input?</p>