class Vector(list):
    def __init__(self, *el):
        for e in el:
            self.append(e)

    def __add__(self, other):
        if type(other) is Vector:
            assert len(self) == len(other), "Error 0"
            r = Vector()
            for i in range(len(self)):
                r.append(self[i] + other[i])
            return r
        else:
            other = Vector.emptyvec(lens=len(self), n=other)
            return self + other

    def __sub__(self, other):
        if type(other) is Vector:
            assert len(self) == len(other), "Error 0"
            r = Vector()
            for i in range(len(self)):
                r.append(self[i] - other[i])
            return r
        else:
            other = Vector.emptyvec(lens=len(self), n=other)
            return self - other

    def __mul__(self, other):
        if type(other) is Vector:
            assert len(self) == len(other), "Error 0"
            r = Vector()
            for i in range(len(self)):
                r.append(self[i] * other[i])
            return r
        else:
            other = Vector.emptyvec(lens=len(self), n=other)
            return self * other

    def __truediv__(self, other):
        if type(other) is Vector:
            assert len(self) == len(other), "Error 0"
            r = Vector()
            for i in range(len(self)):
                r.append(self[i] / other[i])
            return r
        else:
            other = Vector.emptyvec(lens=len(self), n=other)
            return self / other

    def __pow__(self, other):
        if type(other) is Vector:
            assert len(self) == len(other), "Error 0"
            r = Vector()
            for i in range(len(self)):
                r.append(self[i] ** other[i])
            return r
        else:
            other = Vector.emptyvec(lens=len(self), n=other)
            return self ** other

    def __mod__(self, other):
        return sum((self - other) ** 2) ** 0.5

    def mod(self):
        return self % Vector.emptyvec(len(self))

    def dim(self):
        return len(self)

    def __str__(self):
        if len(self) == 0:
            return "Empty"
        r = [str(i) for i in self]
        return "< " + " ".join(r) + " >"

    def _ipython_display_(self):
        print(str(self))

    @staticmethod
    def emptyvec(lens=2, n=0):
        return Vector(*[n for i in range(lens)])

    @staticmethod
    def randvec(dim):
        return Vector(*[random.random() for i in range(dim)])