title: How to input one letter at a time in python?
body: <p>I want to take one letter at a time in python. can we take one letter at a time using "<strong>input()</strong>" in python3</p>
  
  <p>Example: I want to input only one letter such as a. b, c, .....etc. It should not accept more than one letter word such as ab, as, asa ... etc.
  is there any such function in python 3?</p>