#include 
#include 
#include 
#include 
using namespace std;
int main(){
    priority_queue pq;
    pq.push(5);
    pq.push(2);
    pq.push(6);
    pq.push(8);
    
    
    while(!pq.empty()) {
        cout << pq.top() << " " ;
        pq.pop();
    }
    
    return 0;
}