import sys


class ExtendedList(list):
    def __getattr__(self, name):
        correct = False
        if name == "R" or name == "reversed":
            return self[::-1]
        if name == "S" or name == "size":
            return len(self)
        if name == "F" or name == "first":
            return self[0]
        if name == "L" or name == "last":
            return self[-1]
        raise AttributeError

    def __setattr__(self, name, value):
        if name == "S" or name == "size":
            if (value < len(self)):
                for i in range(len(self) - value):
                    self.pop()
            if (value > len(self)):
                for i in range(value - len(self)):
                    self.append(None)
            return
        if name == "L" or name == "last":
            self[-1] = value
            return
        if name == "F" or name == "first":
            self[0] = value
            return
        raise AttributeError


exec(sys.stdin.read())
-----------------------------------------------------------------------------------------------------------
import sys


class ExtendedList(list):
    aliases = {
        'reversed': 'R',
        'first': 'F',
        'last': 'L',
        'size': 'S'
    }

    def __init__(self, elements=[]):
        list.__init__(self, elements)

    def __setattr__(self, name, value):
        name = self.aliases.get(name, name)
        if (name == 'F'):
            self[0] = value
        elif (name == 'L'):
            self[-1] = value
        elif (name == 'S'):
            if value < 0:
                raise KeyError
            if (value < len(self)):
                del self[value:]
            else:
                self.extend([None] * (value - len(self)))
        else:
            object.__setattr__(self, name, value)

    def __getattr__(self, name):
        name = self.aliases.get(name, name)
        if (name == 'R'):
            return self[::-1]
        elif (name == 'F'):
            return self[0]
        elif (name == 'L'):
            return self[-1]
        elif (name == 'S'):
            return len(self)
        return object.__getattribute__(self, name)

exec(sys.stdin.read())
-----------------------------------------------------------------------------------------------------------
import sys


class ExtendedList(list):
    def _get_first(self):
        return self.__getitem__(0)

    def _set_first(self, val):
        self.__setitem__(0, val)
    first = property(fget=_get_first, fset=_set_first)
    F = first

    def _get_last(self):
        return self.__getitem__(self.__len__() - 1)

    def _set_last(self, val):
        return self.__setitem__(self.__len__() - 1, val)
    last = property(fget=_get_last, fset=_set_last)
    L = last

    def _get_reversed(self):
        copy = ExtendedList()
        for i in range(self.__len__()):
            copy.append(self[self.__len__() - i - 1])
        return copy
    reversed = property(fget=_get_reversed)

    R = reversed

    def _get_len(self):
        return self.__len__()

    def _set_len(self, val):
        current_length = self.__len__()
        if current_length < val:
            for i in range(val - current_length):
                self.append(None)
        if current_length > val:
            for i in range(current_length - val):
                self.pop()
    size = property(fget=_get_len, fset=_set_len)
    S = size


exec(sys.stdin.read())