#include <bits/stdc++.h>
using namespace std;
bool check(string s) {
  int count = 0;
  for (char el : s) {
    if (el == '(') {
      count++;
    } else {
      count--;
    }
    if (count < 0) return false;
  }
  return true;
}
void solve() {
  int n;
  cin >> n;
  string s;
  cin >> s;
  if (s[0] == ')' || s[s.size() - 1] == '(' || s.size() % 2) {
    cout << ":(" << endl;
    return;
  }
  int in = 0, out = 0;
  for (char el : s) {
    in += (el == '(');
    out += (el == ')');
  }
  if (in > n / 2 || out > n / 2) {
    cout << ":(" << endl;
    return;
  }
  int first = (n / 2) - in;
  int second = (n / 2) - out;
  int count = 0;
  for (int i = 0; i < n; i++) {
    if (s[i] == '?') {
      if (first > 0) {
        s[i] = '(';
        first--;
        count++;
      } else {
        s[i] = ')';
        second--;
        count--;
      }
    } else if (s[i] == '(') {
      count++;
    } else {
      count--;
    }
    if (count == 0 && i != n - 1) {
      cout << ":(" << endl;
      return;
    } else if (count < 0) {
      cout << ":(" << endl;
      return;
    }
  }
  cout << (check(s) ? s : ":(") << endl;
}
int main() { solve(); }
