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 atcoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();

            
            int ans = 0;
            string ope = "";

            for (int bit = 0; bit < (1 << (str.Length - 1)); bit++)
            {
                ans = int.Parse(str[0].ToString());
                ope = str[0].ToString();
                for (int i = 1; i < str.Length; i++)
                {
                    if ((bit & (1 << i - 1)) == (1 << i - 1))
                    {
                        ans += int.Parse(str[i].ToString());
                        ope += "+";
                    }
                    else
                    {
                        ans -= int.Parse(str[i].ToString());
                        ope += "-";
                    }
                    ope += str[i].ToString();
                }
                ope += "=7";
                if (ans == 7)
                {
                    Console.WriteLine(ope);
                    return;
                }
            }
        }
    }
}