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;

namespace ABC097_C
{
    class Program
    {
        static void Main(string[] args)
        {
            var N = Console.ReadLine();
            var A = int.Parse(N[0].ToString());
            var B = int.Parse(N[1].ToString());
            var C = int.Parse(N[2].ToString());
            var D = int.Parse(N[3].ToString());
            var s = "";
            if (A + B + C + D == 7) s = A +"+" + B + "+" + C + "+" + D + "=7";
            if (A - B + C + D == 7) s = A +"-" + B + "+" + C + "+" + D + "=7";
            if (A + B - C + D == 7) s = A +"+" + B + "-" + C + "+" + D + "=7";
            if (A + B + C - D == 7) s = A +"+" + B + "+" + C + "-" + D + "=7";
            if (A - B - C + D == 7) s = A +"-" + B + "-" + C + "+" + D + "=7";
            if (A - B + C - D == 7) s = A +"-" + B + "+" + C + "-" + D + "=7";
            if (A + B - C - D == 7) s = A +"+" + B + "-" + C + "-" + D + "=7";
            if (A - B - C - D == 7) s = A +"-" + B + "-" + C + "-" + D + "=7";
            Console.WriteLine(s);
        }
    }
}