title: Give a maximum/minimum number of characters(String) for a variable, Python
body: <p>There's some French in the code but don't worry about it, the only thing I want to do here is add something that will prevent me from entering a string under 4 in ch1 and at least 1 character in ch2. this code works for what I'm doing.</p>
  
  <pre><code>ch1 = input("Entre the first chain:")
  ch2 = input('Enter the second chain:')
  resultat = 0
  sub_len = len(ch2)
  
  
  for i in range(len(ch1)):
      if ch1[i:i+sub_len] == ch2:
          resultat += 1
  
  print('Chaîne 1 saisie: {}'.format(ch1))
  print('Chaîne 2 saisie: {}'.format(ch2))
  print('Réponse: La chaîne 2 se retrouve {} fois dans la châine 1.'.format(resultat))
  </code></pre>