d

#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
#define pii pair<int , int>
#define _FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define MAXX  105

multiset<int> ms; //multiset<type> name
multiset<int>::iterator it;//multiseti iteratorlar geze biler
int main()
{
    _FastIO;
   ms.insert(4);//multisete 4elemntini artirdiq
   ms.insert(4);//multisete yene de 4 lementini artirdiq amma multiset ferli eded de saxlayacaq
   ms.insert(5);//multisete 5 elementini artirdiq
   ms.insert(1);//multisete 1 elementini artirdiq
   cout << ms.size() << endl;// 4 cunki ne qeder elemnt artirmisiq onun sayini goturecek
    for(auto i : ms){// en zoru budur
        cout << i << " ";//ozu avtomatik verir
    }
    //bundan bele qerara geldik ki multiset sortlanmis massivdi hem de sort funksiyasi elemeden vaxt qazandiq
    return 0;
}