code: '''simple docstring'''
  
  
  
  
  
  import numpy as np
  
  _SCREAMING_SNAKE_CASE   						=    [
      ["""a""", """b""", """c""", """d""", """e"""],
      ["""f""", """g""", """h""", """i""", """k"""],
      ["""l""", """m""", """n""", """o""", """p"""],
      ["""q""", """r""", """s""", """t""", """u"""],
      ["""v""", """w""", """x""", """y""", """z"""],
  ]
  
  
  
  
  
  
  
  class 					UpperCAmelCase_				:
  
  
  
  
      def __init__(					self  :   Optional[int]   )	-> None:
        a__     		=     np.array(lowerCAmelCase   )
  
  
  
  
      def 						__lowerCamelCase (					self  :   List[Any]      ,      lowerCAmelCase  :   str   )	-> np.ndarray:
        a__		,a__     		=     np.where(letter == self.SQUARE   )
        a__     		=     np.concatenate([indexa + 1, indexa + 1]   )
        return indexes
  
  
  
  
      def 						__lowerCamelCase (					self  :   Dict      ,      lowerCAmelCase  :   int      ,      lowerCAmelCase  :   int   )	-> str:
        return self.SQUARE[indexa - 1, indexa - 1]
  
  
  
  
      def 						__lowerCamelCase (					self  :   int      ,      lowerCAmelCase  :   str   )	-> str:
        a__     		=     message.lower()
        a__     		=     message.replace("j"      ,      "i"   )
  
        a__     		=     ""
        for letter_index in range(len(lowerCAmelCase   )   ):
          if message[letter_index] != " ":
            a__     		=     self.letter_to_numbers(message[letter_index]   )
            a__     		=     encoded_message + str(numbers[0]   ) + str(numbers[1]   )
          elif message[letter_index] == " ":
            a__     		=     encoded_message + " "
  
        return encoded_message
  
  
  
  
      def 						__lowerCamelCase (					self  :   Optional[int]      ,      lowerCAmelCase  :   str   )	-> str:
        a__     		=     message.replace(" "      ,      "  "   )
        a__     		=     ""
        for numbers_index in range(int(len(lowerCAmelCase   ) / 2   )   ):
          if message[numbers_index * 2] != " ":
            a__     		=     message[numbers_index * 2]
            a__     		=     message[numbers_index * 2 + 1]
  
            a__     		=     self.numbers_to_letter(int(lowerCAmelCase   )      ,      int(lowerCAmelCase   )   )
            a__     		=     decoded_message + letter
          elif message[numbers_index * 2] == " ":
            a__     		=     decoded_message + " "
  
        return decoded_message
  
  
style_context: def 				__lowercase	(						lowerCamelCase__ ,				lowerCamelCase__					)				->Optional[int]:
  
    '''simple docstring'''
  
  
  
  
    sequence.append(lowerCamelCase__					)
  
    a__     		=     0
    while sequence[index] != target:
      index += 1
  
    sequence.pop()
  
    if index == len(lowerCamelCase__					):
      return None
  
    return index
  
  
  if __name__ == "__main__":
       _SCREAMING_SNAKE_CASE   						=    input("""Enter numbers separated by comma:\n""").strip()
       _SCREAMING_SNAKE_CASE   						=    [int(item) for item in user_input.split(""",""")]
  
       _SCREAMING_SNAKE_CASE   						=    input("""Enter a single number to be found in the list:\n""")
       _SCREAMING_SNAKE_CASE   						=    int(target_input)
       _SCREAMING_SNAKE_CASE   						=    sentinel_linear_search(sequence, target)
       if result is not None:
            print(F"""{target} found at positions: {result}""")
       else:
            print("""Not found""")
  
  