input:     
  def is_palindrome(s: str) -> bool:
      """
      This function returns True if the input string s is a palindrome and False otherwise. 
      A palindrome is a word, phrase, number, or other sequence of characters that reads the same backward as forward.
      
      Example:
      >>> is_palindrome("racecar")
      True
      >>> is_palindrome("hello")
      False
      """
  
output:     return s == s[::-1]