// NOTE: it is recommended to use this even if you don't understand the following code.

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

using namespace std;

int main() {
    // uncomment the two following lines if you want to read/write from files
    // ifstream cin("input.txt");
    // ofstream cout("output.txt");

    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    cin >> N;

    vector<int> A(N);
    for (int i = 0; i < N; ++i)
        cin >> A[i];

    string ans = "";



    if(N == 2){
        if(A[0] == A[1]){
            for(int i = 0; i < A[0]; i++) ans = ans + '(';
            for(int i = 0; i < A[0]; i++) ans = ans + ')';
        }
        else ans = "-1";
    }


    cout << ans << endl;

    return 0;
}