| f | import sys | f | import sys | 
             |  |  |  | 
            | n | class SizeD: | n | class SizeDescriptor: | 
             |  |  |  | 
             |     def __init__(self): |  |     def __init__(self): | 
            | n |         self._size = None | n |         self._custom_value = None | 
             |  |  |  | 
            | n |     def __get__(self, obj, cls): | n |     def __get__(self, instance, owner): | 
             |         if self._size is not None: |  |         if self._custom_value is not None: | 
             |             return self._size |  |             return self._custom_value | 
             |         if hasattr(obj, '__len__'): |  |         if hasattr(instance, '__len__'): | 
             |             return len(obj) |  |             return len(instance) | 
             |         if hasattr(obj, '__abs__'): |  |         if hasattr(instance, '__abs__'): | 
             |             return abs(obj) |  |             return abs(instance) | 
             |         return 0 |  |         return 0 | 
             |  |  |  | 
            | n |     def __set__(self, obj, value): | n |     def __set__(self, instance, new_value): | 
             |         self._size = value |  |         self._custom_value = new_value | 
             |  |  |  | 
            | n |     def __delete__(self, obj): | n |     def __delete__(self, instance): | 
             |         self._size = None |  |         self._custom_value = None | 
             |  |  |  | 
             | def sizer(cls): |  | def sizer(cls): | 
            | t |     cls.size = SizeD() | t |     cls.size = SizeDescriptor() | 
             |     return cls |  |     return cls | 
             | exec(sys.stdin.read()) |  | exec(sys.stdin.read()) |