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

int main() {
    list<int> l1;
    l1.push_front(1);
    l1.push_front(2);
    l1.push_front(3);
    l1.push_back(4);
    l1.push_back(5);


    list<int>::iterator it = find(l1.begin(), l1.end(), 10);

    if(it != l1.end()) {
        cout << *it << endl;
    }
    else {
        cout << "Elementot ne postoi" << endl;
    }
    return 0;
}