class Stack:
    def __init__(self):
        self.numbers = []

    def push(self, value0):
        self.numbers.append(value0)

    def pop(self):
        if len(self.numbers) == 0:
            return None
        self.numbers.pop()

    def reverse(self):
        self.numbers.reverse()

    def print(self):
        for i in self.numbers:
            print(i, end=' ')


S = Stack()
M = int(input())
for i in range(M):
    Prompt = input().split()
    if Prompt[0] == "push":
        Temp = float(Prompt[1])
        S.push(Temp)
    elif Prompt[0] == "reverse":
        S.reverse()
    else:
        S.pop()
S.reverse()
S.print()