from copy import copy

class Queue:
    def __init__(self, *values):
        self.q = list(values)

    def __str__(self):
        q = ' -> '.join(map(str, self.q))
        return f'[{q}]'

    def __next__(self):
        n = self.q[1:]
        return Queue(*n)

    def __eq__(self, other):
        return self.q[:] == other.q[:]

    def __add__(self, other):
        return copy(Queue(*(self.q + other.q)))

    def __rshift__(self, other):
        n = self.q[other:]
        return Queue(*n)

    def __iadd__(self, other):
        return Queue(*(self.q + other.q))

    def extend(self, queue):
        self.q.extend(queue.q)

    def append(self, *values):
        self.q += list(values)

    def copy(self):
        return Queue(*self.q)

    def pop(self):
        return self.q.pop(0)

    def next(self):
        n = self.q[1:]
        return Queue(*n)