
from __future__ import annotations

import numpy as np






def   lowerCamelCase__							(					a      )      ->   tuple[np.ndarray, np.ndarray]:
   _A			,  _A:  Any					=       np.shape(a      )
   if rows != columns:
      _A:  Any					=       (
          '''\'table\' has to be of square shaped array but got a '''
          f"""{rows}x{columns} array:\n{table}"""
      )
      raise ValueError(a      )

   _A:  Optional[Any]					=       np.zeros((rows, columns)      )
   _A:  Dict					=       np.zeros((rows, columns)      )
   for i in range(a      ):
      for j in range(a      ):
         _A:  Any					=       sum(lower[i][k] * upper[k][j] for k in range(a      )      )
         if upper[j][j] == 0:
            raise ArithmeticError('''No LU decomposition exists'''      )
         _A:  List[str]					=       (table[i][j] - total) / upper[j][j]
      _A:  str					=       1
      for j in range(a		,		a      ):
         _A:  List[Any]					=       sum(lower[i][k] * upper[k][j] for k in range(a      )      )
         _A:  Any					=       table[i][j] - total
   return lower, upper


if __name__ == "__main__":
   import doctest

   doctest.testmod()





def   lowerCamelCase__							(					a      )      ->   bool:
   _A:  Dict					=       [int(a      ) for i in ip_va_address.split('''.'''      ) if i.isdigit()]
   return len(a      ) == 4 and all(0 <= int(a      ) <= 2_54 for octet in octets      )


if __name__ == "__main__":
   UpperCAmelCase__		:     str     			=      input().strip()
   UpperCAmelCase__		:     Any     			=      'valid' if is_ip_va_address_valid(ip) else 'invalid'
   print(F"""{ip} is a {valid_or_invalid} IP v4 address.""")



