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 ABC_C
{
    class C079
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int[] g = s.Select(x => x - '0').ToArray();


            for (int i = 0; i < 8; i++)
            {
                int[] h = (int[])g.Clone();
                int k = i;
                for (int j = 0; j < 3; j++)
                {
                    if (k % 2 == 1)
                    {
                        h[j + 1] *= -1;
                    }
                    k /= 2;

                }

                if (h.Sum() == 7)
                {

                    string r = g[0].ToString();
                    for(int j = 0; j < 3; j++)
                    {
                        if (h[j+1] >= 0) r += "+" + h[j+1];
                        else r += h[j+1];
                    }
                    r += "=7";
                    Console.WriteLine(r);
                    break;
                }
            }
        }

    }
}