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