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: Wrong Answer)

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

class Program
{
    static void Main(string[] args)
    {
        // 入力
        string abcd = Console.ReadLine();
        int a = int.Parse(abcd[0].ToString());
        int c = int.Parse(abcd[1].ToString());
        int b = int.Parse(abcd[2].ToString());
        int d = int.Parse(abcd[3].ToString());

        StringBuilder ans = new StringBuilder("");
        var op1 = "";
        var op2 = "";
        var op3 = "";

        if (a + b + c + d == 7)
        {
            op1 = "+";
            op2 = "+";
            op3 = "+";
        }

        if (a + b - c + d == 7)
        {
            op1 = "+";
            op2 = "-";
            op3 = "+";
        }

        if (a + b - c - d == 7)
        {
            op1 = "+";
            op2 = "-";
            op3 = "-";
        }

        if (a + b + c - d == 7)
        {
            op1 = "+";
            op2 = "+";
            op3 = "-";
        }

        if (a - b + c + d == 7)
        {
            op1 = "-";
            op2 = "+";
            op3 = "+";
        }

        if (a - b - c + d == 7)
        {
            op1 = "-";
            op2 = "-";
            op3 = "+";
        }

        if (a - b - c - d == 7)
        {
            op1 = "-";
            op2 = "-";
            op3 = "-";
        }

        if (a - b + c - d == 7)
        {
            op1 = "-";
            op2 = "+";
            op3 = "-";
        }

        ans.Append(a);
        ans.Append(op1);
        ans.Append(b);
        ans.Append(op2);
        ans.Append(c);
        ans.Append(op3);
        ans.Append(d);
        ans.Append("=7");
        Console.WriteLine(ans);
    }
}