#include <bits/stdc++.h>

#define times(I, X) for (int I=0; I<X; I++)

#ifdef DEBUG
    #define deb(X) X
    #define log(X) std::cout << X << "\n"
    #define dump(X) std::cout << __LINE__ << "L: [" << #X << "] = [" << X << "]\n"
#else
    #define deb(X)
    #define log(X)
    #define dump(X)
#endif
#define fi first
#define se second
#define pb push_back

using namespace std;
using ll = long long;
using ull = unsigned long long;


int main() {
    #ifndef DEBUG
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    // freopen("forest.in", "r", stdin);
    // freopen(s"forest.out", "w", stdout);
    #endif
    int n;
    cin >> n;
    string s;
    cin >> s;
    int r = n / 2, l = n / 2;
    for(int i = 0; i < n; i++)
    {
        char c = s[i];
        if(c == '(')
        {
            r--;
        }
        else if(c == ')')
        {
            l--;
        }
    }

    if(n % 2 == 1 || s[0] == ')' || s[n - 1] == '(')
    {
        cout << ":(";
        return 0;
    }

    int bracket = 0;

    for(int i = 0; i < n; i++)
    {
        if(s[i] == '(')
        {
            bracket++;
        }
        else if(s[i] == ')')
        {
            if(bracket == 0)
            {
                cout << ":(";
                return 0;
            }
            else{
                bracket--;
            }
        }
        else{
            if(r > 0)
            {
                s[i] = '(';
                r--;
                bracket++;
            }
            else{
                s[i] = ')';
                l--;
                if(bracket == 0)
                {
                    cout << ":(";
                    return 0;
                }
                else{
                        bracket--;
                }
            }
        }
        if(i != n - 1 && bracket == 0) {
            cout << ":(";
            return 0;
        }
    }
    if(bracket != 0)
    {
        cout << ":(";
        return 0;
    }
    cout << s;
    return 0;
}

//((?()(?)?)