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;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace AtCoder.ABC079.C
{
    class Program
    {
        static void Main ()
        {
            var inputs = Console.ReadLine ().Select (elem => int.Parse (elem.ToString ()))
                .ToArray ();
            const int aim = 7;
            int result = 0;
            for (int i = 0; i < 2; i++)
            {
                for (int j = 0; j < 2; j++)
                {
                    for (int k = 0; k < 2; k++)
                    {
                        if (i == 0) result = inputs[0] + inputs[1];
                        else result = inputs[0] - inputs[1];
                        if (j == 0) result += inputs[2];
                        else result -= inputs[2];
                        if (k == 0) result += inputs[3];
                        else result -= inputs[3];
                        if (result == aim)
                        {
                            var ops = new char[] { '+', '-' };
                            Console.WriteLine (inputs[0].ToString () + ops[i] + inputs[1] + ops[j] + inputs[2] + ops[k] + inputs[3] + "=7");
                            return;
                        }
                    }
                }
            }
        }
    }
}