2. Stacked Queries

stack = []

def delete():
    stack.pop()

def print_max():
    max_value = max(stack)
    print(*max_value)

def print_min():
    min_value = min(stack)
    print(*min_value)

commands = {
    '2': delete,
    '3': print_max,
    '4': print_min
}

# N = int(input())
# for _ in range(N):
#     query = input().split()
#     command = query[0]
#     if command == '1':
#         number = int(query[1])
#         commands[command](number)
#     else:
#         commands[command]()

N = int(input())
for _ in range(N):
    command, *numbers = input().split()
    if command == '1':
        number = [int(num) for num in numbers]
        stack.append(number)
    else:
        if stack:
            commands[command]()

reversed_stack = reversed(stack)
print(', '.join(str(*item) for item in reversed_stack))