reabin

#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

set<int> s; //set<type> name
set<int>::iterator it;//set yalniz iteratorlar geze biler
int main()
{
    _FastIO;
   s.insert(4);//sete 4elemntini artirdiq
   s.insert(4);//sete yene de 4 lementini artirdiq amma set ferli eded saxlayacaq
   s.insert(5);//sete 5 elementini artirdiq
   s.insert(1);
   cout << s.size() << endl;// 3 cunki oxsar element goturmur
    for(it = s.begin(); it != s.end(); it++){//it movqe *it ise hemin movqedeki elementdi
        cout << *it << " ";// 1 4 5
    }
    return 0;
}