Problem:
Score : 400 points

Problem Statement

You are given a string S of length N consisting of ( and ). Your task is to insert some number of ( and ) into S to obtain a correct bracket sequence.

Here, a correct bracket sequence is defined as follows:

() is a correct bracket sequence.

If X is a correct bracket sequence, the concatenation of (, X and ) in this order is also a correct bracket sequence.

If X and Y are correct bracket sequences, the concatenation of X and Y in this order is also a correct bracket sequence.

Every correct bracket sequence can be derived from the rules above.

Find the shortest correct bracket sequence that can be obtained. If there is more than one such sequence, find the lexicographically smallest one.

Constraints

The length of S is N.

1 ≤ N ≤ 100

S consists of ( and ).

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the lexicographically smallest string among the shortest correct bracket sequences that can be obtained by inserting some number of ( and ) into S.

Sample Input 1

3
())

Sample Output 1

(())

Sample Input 2

6
)))())

Sample Output 2

(((()))())

Sample Input 3

8
))))((((

Sample Output 3

(((())))(((())))

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using static MyIO;


public class D
{
	public static void Main()
	{
		int N = GetInt();
		string S = GetString();

		bool[] isIgnore = new bool[N];
		bool isUpdated = true;
		while(isUpdated)
		{
			isUpdated = false;
			int iLeft = -1;
			for(int i = 0; i < N; i++)
			{
				if(isIgnore[i])
					continue;
				
				if(S[i] == '(')
				{
					iLeft = i;
					continue;
				}

				if(iLeft != -1)
				{
					isIgnore[iLeft] = true;
					isIgnore[i] = true;
					iLeft = -1;
					isUpdated = true;
				}
			}
		}

		int numAddLeft = 0;
		int numAddRight = 0;
		for(int i = 0; i < N; i++)
		{
			if(isIgnore[i])
				continue;
			if(S[i] == ')')
			{
				numAddLeft++;
			}
			else
			{
				numAddRight++;
			}
		}

		StringBuilder ans = new StringBuilder();
		for(int i = 0; i < numAddLeft; i++)
			ans.Append('(');
		ans.Append(S);
		for(int i = 0; i < numAddRight; i++)
			ans.Append(')');
		Console.WriteLine(ans);		
	}
}


public static class MyIO
{
	private static string[] args = null;
	private static int num = -1;
	private static int used = -1;

	private static string getArg()
	{
		if(used == num)
		{
			args = Console.ReadLine().Split(' ');
			num = args.Length;
			used = 0;
		}
		return args[used++];
	}

	public static int GetInt(){ return int.Parse(getArg()); }
	public static long GetLong(){ return long.Parse(getArg()); }
	public static double GetDouble(){ return double.Parse(getArg()); }
	public static string GetString(){ return getArg(); }
}