#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <unordered_set>
#include <algorithm>



using namespace std;

std::unordered_set<std::vector<int>> get_triple(int A, std::vector<int>& x) {
    std::unordered_set<int> history;
    std::sort(x.begin(), x.end());
    std::unordered_set<std::vector<int>> triples;

    for (int i = 0; i < x.size(); i++) {
        for (int j = i + 1; j < x.size(); j++) {
            int target = A - x[i] - x[j];
            if (history.find(target) != history.end()) {
                std::vector<int> triple = { target, x[i], x[j] };
                triples.insert(triple);
            }
        }
        history.insert(x[i]);
    }

    return triples;
}


int main() {

    ifstream fin("input.txt");

    int a = 10;

    std::vector<int> vec{ 5,2,8,1,1,3,4,4 };

    std::unordered_set<std::vector<int>> result = get_triple(a, vec);

    for (auto& triple : result) {
        for (auto element : triple) {
            cout << element << " ";
        }
        cout << endl;
    }
}