code: 
  
  
  from __future__ import annotations
  
  
  
  
  
  
  
  class   lowerCAmelCase__ :
  
  
  
  
       '''simple docstring'''
  
  
       def __init__(		self				,		__lowerCamelCase)    ->       None:
              _A   : str       					=				data
              _A   : List[Any]       					=				None
  
  
  
  
  
  
  
  class   lowerCAmelCase__ :
  
  
  
  
       '''simple docstring'''
  
  
       def __init__(		self)    ->       List[str]:
              _A   : str       					=				None
  
  
       def 				_lowerCamelCase				(		self				,		__lowerCamelCase)    ->       int:
              _A   : List[Any]       					=				Node(__lowerCamelCase)
              _A   : str       					=				self.head
              _A   : Tuple       					=				new_node
              return self.head.data
  
  
       def 				_lowerCamelCase				(		self)    ->       int | None:
              _A   : Tuple       					=				self.head
              _A   : Tuple       					=				self.head
              if self.head:
                     while fast_pointer and fast_pointer.next:
                            _A   : str       					=				fast_pointer.next.next
                            _A   : Union[str, Any]       					=				slow_pointer.next
                     return slow_pointer.data
              else:
                     print("No element found.")
                     return None
  
  
  if __name__ == "__main__":
      lowerCAmelCase__   	=				LinkedList()
      for _ in range(int(input().strip())):
          lowerCAmelCase__   	=				int(input().strip())
          link.push(data)
      print(link.middle_element())
  
style_context: 
  
  
  from typing import TYPE_CHECKING
  
  from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_torch_available, is_vision_available
  
  
  lowerCAmelCase__   	=				{
      'configuration_deta': ['DETA_PRETRAINED_CONFIG_ARCHIVE_MAP', 'DetaConfig'],
  }
  
  try:
      if not is_vision_available():
          raise OptionalDependencyNotAvailable()
  except OptionalDependencyNotAvailable:
      pass
  else:
      lowerCAmelCase__   	=				['DetaImageProcessor']
  
  try:
      if not is_torch_available():
          raise OptionalDependencyNotAvailable()
  except OptionalDependencyNotAvailable:
      pass
  else:
      lowerCAmelCase__   	=				[
          'DETA_PRETRAINED_MODEL_ARCHIVE_LIST',
          'DetaForObjectDetection',
          'DetaModel',
          'DetaPreTrainedModel',
      ]
  
  
  if TYPE_CHECKING:
      from .configuration_deta import DETA_PRETRAINED_CONFIG_ARCHIVE_MAP, DetaConfig
  
      try:
          if not is_vision_available():
              raise OptionalDependencyNotAvailable()
      except OptionalDependencyNotAvailable:
          pass
      else:
          from .image_processing_deta import DetaImageProcessor
  
      try:
          if not is_torch_available():
              raise OptionalDependencyNotAvailable()
      except OptionalDependencyNotAvailable:
          pass
      else:
          from .modeling_deta import (
              DETA_PRETRAINED_MODEL_ARCHIVE_LIST,
              DetaForObjectDetection,
              DetaModel,
              DetaPreTrainedModel,
          )
  
  else:
      import sys
  
      lowerCAmelCase__   	=				_LazyModule(__name__, globals()['__file__'], _import_structure, module_spec=__spec__)
  