title: I don't understand how to return all values in string with return string[i:i+max_width]?
body: <p>I have a code and I wanna return all values in string with newline.</p>
  <pre><code>def wrap(string, max_width):
  for i in range(0, len(string), max_width):
      return string[i:i+max_width]
  
  # You can't change anything here.
  if __name__ == '__main__':
      string, max_width = input(), int(input())
      result = wrap(string, max_width)
      print(result)
  </code></pre>
  <p>My input</p>
  <pre><code>ABCDEFGHIJKLIMNOQRSTUVWXYZ
  4
  </code></pre>
  <p>Required output</p>
  <pre><code>ABCD
  EFGH
  IJKL
  IMNO
  QRST
  UVWX
  YZ
  </code></pre>
  <p>My output</p>
  <pre><code>ABCD
  </code></pre>