#include <iostream>
#include <deque>
using namespace std;
int inputdeque(deque<int> &);
int readdeque(deque<int> &);
int inputback(deque<int> &);
int insertdeque(deque<int> &);
int main()
{
	deque <int> de01;
	inputdeque(de01);
	readdeque(de01);
	inputback(de01);
	readdeque(de01);
	insertdeque(de01);
	readdeque(de01);
	return 0;
}