class Solution:
    # Write your code here
    def __init__(self):
        # We only need one stack/queue buffer
        self.my_buffer = []
        
    def pushCharacter(self, c):
        # Build the buffer here
        self.my_buffer.append(c)
        
    def enqueueCharacter(self, c):
        # Don't bother building a queue
        pass
        
    def popCharacter(self) -> str:
        # Pop the buffer from the end
        return self.my_buffer.pop()
        
    def dequeueCharacter(self) -> str:
        # Pop the buffer from the front
        return self.my_buffer.pop(0)