class Queue:
    queue = []

    def add(self, item):
        self.queue.append(item)

    def remove(self):
        if not self.queue:
            return None
        return self.queue.pop(0)

364914a444b1361b30f30e5bb5100a1b8695e788
<mask token>

class Queue:
    <mask token>
    <mask token>

    def remove(self):
        if not self.queue:
            return None
        return self.queue.pop(0)

class Queue:
    <mask token>

    def add(self, item):
        self.queue.append(item)

    def remove(self):
        if not self.queue:
            return None
        return self.queue.pop(0)

class Queue:
    queue = []

    def add(self, item):
        self.queue.append(item)

    def remove(self):
        if not self.queue:
            return None
        return self.queue.pop(0)
