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;

namespace MyTest
{
	internal class Program
	{
		private static void Main(string[] args)
		{
			var input = Console.ReadLine();
			var A = int.Parse(input[0].ToString());
			var B = int.Parse(input[1].ToString());
			var C = int.Parse(input[2].ToString());
			var D = int.Parse(input[3].ToString());
			List<int> num = new List<int>() { B, C, D };

			List<bool> isPlus = new List<bool>();
			for (int bit = 0; bit < (1 << 3); bit++)
			{
				int sum = A;
				string ret = A.ToString();
				for (int i = 0; i < 3; i++)
				{
					if ((bit & (1 << i)) != 0)
					{
						sum += num[i];
						ret += "+" + num[i].ToString();
					}
					else
					{
						sum -= num[i];
						ret += "-" + num[i].ToString();
					}
				}

				if (sum == 7)
				{
					Console.WriteLine(ret += "=7");
					break;
				}
			}
		}
		//private static void Main(string[] args)
		//{
		//	IExecutable exe = new ABC061C();
		//	exe.Execute();
		//}
	}
}