#include <bits/stdc++.h>
using namespace std;
 
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
 
    int n; 
    cin >> n;
    vector<long long> a(n);
    for(int i=0;i<n;i++) cin >> a[i];
 
    vector<long long> b = a;
    sort(b.begin(), b.end());
 
    for(int i=0;i<n;i++){
        for(int k=i+2;k<n;k++){
            long long s = b[i] + b[k];
            if(s % 2) continue;
            long long mid = s / 2;
            if(binary_search(b.begin()+i+1, b.begin()+k, mid)){
                cout << b[i] << " " << mid << " " << b[k];
                return 0;
            }
        }
    }
 
    cout << "0 0 0";
}

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