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.Linq;//リストの使用
using System.Collections.Generic;
using System.Text;//テキストの高速出力に必要
class Program
{
	static void Main()
	{
		string s = Console.ReadLine();
    int a = s[0] - '0';
    int b = s[1] - '0';
    int c = s[2] - '0';
    int d = s[3] - '0';
    string answer = "";

      if(a+b+c+d == 7)
      {
        answer=a.ToString()+"+"+b.ToString()+"+"+c.ToString()+"+"+d.ToString()+"=7";
      }
      if(a+b+c-d == 7)
      {
        answer=a.ToString()+"+"+b.ToString()+"+"+c.ToString()+"-"+d.ToString()+"=7";
      }
      if(a+b-c+d == 7)
      {
        answer=a.ToString()+"+"+b.ToString()+"-"+c.ToString()+"+"+d.ToString()+"=7";
      }
      if(a+b-c-d == 7)
      {
        answer=a.ToString()+"+"+b.ToString()+"-"+c.ToString()+"-"+d.ToString()+"=7";
      }
      if(a-b+c+d == 7)
      {
        answer=a.ToString()+"-"+b.ToString()+"+"+c.ToString()+"+"+d.ToString()+"=7";
      }
      if(a-b+c-d == 7)
      {
        answer=a.ToString()+"-"+b.ToString()+"+"+c.ToString()+"-"+d.ToString()+"=7";
      }
      if(a-b-c+d == 7)
      {
        answer=a.ToString()+"-"+b.ToString()+"-"+c.ToString()+"+"+d.ToString()+"=7";
      }
      if(a-b-c-d == 7)
      {
        answer=a.ToString()+"-"+b.ToString()+"-"+c.ToString()+"-"+d.ToString()+"=7";
      }
    
		Console.WriteLine(answer);//WriteLineをWriteとすると、改行なしで出力。
	}
}