#include <iostream>
#include <queue>
using namespace std;

int main()
{ queue <int> q;
  q.push(1);
  q.push(2);
  q.push(3);
  cout <<q.size()<<" "<<q.front()<<" "<<q.back()<<" "<<q.empty()<<endl; // 3 1 3 0
  q.pop();
  cout <<q.size()<<" "<<q.front()<<" "<<q.back()<<" "<<q.empty()<<endl; // 2 2 3 0
  q.pop();
  cout <<q.size()<<" "<<q.front()<<" "<<q.back()<<" "<<q.empty()<<endl; // 1 3 3 0
  q.pop();
  cout <<q.size()<<" "<<q.front()<<" "<<q.back()<<" "<<q.empty()<<endl; // 0 0 3 1
  return 0;
}