Problem:
Score : 300 points

Problem Statement

Sitting in a station waiting room, Joisino is gazing at her train ticket.

The ticket is numbered with four digits A, B, C and D in this order, each between 0 and 9 (inclusive).

In the formula A op1 B op2 C op3 D = 7, replace each of the symbols op1, op2 and op3 with + or - so that the formula holds.

The given input guarantees that there is a solution. If there are multiple solutions, any of them will be accepted.

Constraints

0≤A,B,C,D≤9

All input values are integers.

It is guaranteed that there is a solution.

Input

Input is given from Standard Input in the following format:

ABCD

Output

Print the formula you made, including the part =7.

Use the signs + and -.

Do not print a space between a digit and a sign.

Sample Input 1

1222

Sample Output 1

1+2+2+2=7

This is the only valid solution.

Sample Input 2

0290

Sample Output 2

0-2+9+0=7

0 - 2 + 9 - 0 = 7 is also a valid solution.

Sample Input 3

3242

Sample Output 3

3+2+4-2=7

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {

        static int A;
        static int B;
        static int C;
        static int D;

        static int[] H;

        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            A = int.Parse(s[0].ToString());
            B = int.Parse(s[1].ToString());
            C = int.Parse(s[2].ToString());
            D = int.Parse(s[3].ToString());

            H = new int[4] { A, B, C, D };

            Saiki(0, A,A.ToString());
            
        }

        static void Saiki(int i,int sum,string f)
        {
            if(i == 3)
            {
                if(sum == 7)
                {
                    Console.WriteLine(f +"=7");
                    Environment.Exit(0);
                }
            }
            else
            {
                Saiki(i + 1, sum + H[i+1], $"{f}+{H[i+1]}");
                Saiki(i + 1, sum - H[i+1], $"{f}-{H[i+1]}");

            }

        }


    }
    

    

}