本关任务：实现循环队列的基本操作：初始化、入队、出队、遍历等并使用这些操作。队列中元素是大写或小写字母。输入输出输入格式：两行第一行是一个正整数n表示出队和入队的次数第二行是n次出队和入队操作序列其中1表示入队0表示出队如果是入队则1后跟一个大写或小写字母。输出格式：遍历队列内容从队尾到队首输出所有字母如果队为空则输出Queue Empty!输入输出样例：输入51f1e1d00输出：e

class Queue:
    def __init__(self, capacity):
        self.capacity = capacity
        self.queue = [''] * capacity
        self.front = 0
        self.rear = 0
        self.size = 0
    
    def is_empty(self):
        return self.size == 0
    
    def is_full(self):
        return self.size == self.capacity
    
    def enqueue(self, item):
        if self.is_full():
            return False
        self.queue[self.rear] = item
        self.rear = (self.rear + 1) % self.capacity
        self.size += 1
        return True
    
    def dequeue(self):
        if self.is_empty():
            return None
        item = self.queue[self.front]
        self.front = (self.front + 1) % self.capacity
        self.size -= 1
        return item
    
    def traverse(self):
        if self.is_empty():
            return "Queue Empty!"
        result = ""
        i = self.front
        while i != self.rear:
            result = self.queue[i] + result
            i = (i - 1) % self.capacity
        return result

n = int(input())
operations = input()

queue = Queue(n)
for operation in operations:
    if operation == '1':
        item = input()
        queue.enqueue(item)
    elif operation == '0':
        queue.dequeue()

print(queue.traverse())
``