# Enter your code here. Read input from STDIN. Print output to STDOUT

from collections import deque

stack = deque()
stack2 = deque()

if __name__ == '__main__':
    n = int(input())
    for i in range(n):
        input_value = input()
        inp = list(map(int, input_value.split()))
        if inp[0] == 1:
            while(stack2):
                stack.append(stack2.pop())
            obj = inp[1]
            stack.append(obj)
        elif inp[0] == 2:
            while(stack):
                stack2.append(stack.pop())
            stack2.pop()
        else:
            while(stack):
                stack2.append(stack.pop())
            to_print = stack2.pop()
            print(to_print)
            stack2.append(to_print)