def is_palindrome(s):                                                                                       
      if len(s) <= 1:                                                                                                   
          return True                                                                                                   
      if s[0] != s[-1]:                                                                                                 
          return False                                                                                                  
      return is_palindrome(s[1:-1])
      
print(is_palindrome("racecar"))