import queue

class Solution:
    def __init__(self):
        self.queue = queue.Queue()
        self.stack = queue.LifoQueue()
    
    def pushCharacter(self,ch):
        self.stack.put(ch)
        
    def enqueueCharacter(self,ch):
        self.queue.put(ch)
    
    def popCharacter(self):
        return self.stack.get()
    
    def dequeueCharacter(self):
        return self.queue.get()