code: 
  
  
  """simple docstring"""
  
  
  
  
  from __future__ import annotations
  
  
  
  
  
  def 			a_   (  lowercase__   :float | int, lowercase__   :float | int, lowercase__   :float | int, ):
  			if not all((nth_term, start_term_a, common_ratio_r)    ):
  						return []
  			__lowerCamelCase        =			[]
  			__lowerCamelCase        =			1
  			__lowerCamelCase        =			common_ratio_r
  			for _ in range(int(lowercase__    )    ):
  						if not series:
  									series.append(lowercase__    )
  						else:
  									power += 1
  									series.append(float(start_term_a * multiple    )    )
  									__lowerCamelCase        =			pow(float(lowercase__    ), lowercase__    )
  			return series
  
  
  if __name__ == "__main__":
  					import doctest
  
  					doctest.testmod()
  
  					__magic_name__	:   Any          =							float(input('Enter the last number (n term) of the Geometric Series'))
  					__magic_name__	:   Dict          =							float(input('Enter the starting term (a) of the Geometric Series'))
  					__magic_name__	:   Tuple          =							float(
  					    input('Enter the common ratio between two terms (r) of the Geometric Series')
  					)
  					print('Formula of Geometric Series => a + ar + ar^2 ... +ar^n')
  					print(geometric_series(nth_term, start_term_a, common_ratio_r))
  
  
  
  
  
style_context: 
  
  
  """simple docstring"""
  
  
  
  
  def 			a_   (  lowercase__   :str, lowercase__   :int = 13    ):
  			__lowerCamelCase        =			""""""
  			for c in s:
  						if "A" <= c <= "Z":
  									out += chr(ord("""A"""    ) + (ord(lowercase__    ) - ord("""A"""    ) + n) % 26    )
  						elif "a" <= c <= "z":
  									out += chr(ord("""a"""    ) + (ord(lowercase__    ) - ord("""a"""    ) + n) % 26    )
  						else:
  									out += c
  			return out
  
  
  
  
  
  def 			a_   (  ):
  			__lowerCamelCase        =			input("""Enter message: """    )
  
  			__lowerCamelCase        =			dencrypt(lowercase__, 13    )
  			print("""Encryption:""", lowercase__    )
  
  			__lowerCamelCase        =			dencrypt(lowercase__, 13    )
  			print("""Decryption: """, lowercase__    )
  
  
  if __name__ == "__main__":
  					import doctest
  
  					doctest.testmod()
  					main()
  
  
  
  
  