#include <iostream>
#include <queue>

using namespace std;

int main(){
	queue<int> fila;
	for(int cont = 0; cont < 10; cont++){
		fila.push(cont);
	}
	cout << fila.front() << endl;
	cout << fila.back() << endl;
	cout << fila.front() << endl;

	for(int cont = 0; cont < 9; cont++){
		fila.pop();
		if(fila.empty()){
			cout << "Vazio na iteração " << cont + 1 << endl;
		}
	}
}