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.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;

namespace AtCorders
{
	public class Program
	{
		static void Main(string[] args)
		{
			var abcd = Console.ReadLine();
			for (int i = 0; i < 1 << 3; i++) {
				int val = abcd[0] - '0';
				for (int j = 0; j < 3; j++) {
					if ((i & (1 << j)) != 0) {
						val += abcd[j + 1] - '0';
					} else {
						val -= abcd[j + 1] - '0';
					}
				}

				if (val == 7) {
					var sb = new StringBuilder();
					sb.Append(abcd[0]);
					sb.Append((i & (1 << 0)) != 0 ? '+' : '-');
					sb.Append(abcd[1]);
					sb.Append((i & (1 << 1)) != 0 ? '+' : '-');
					sb.Append(abcd[2]);
					sb.Append((i & (1 << 2)) != 0 ? '+' : '-');
					sb.Append(abcd[3]);
					Console.WriteLine(sb.ToString());
					return;
				}
			}
		}
	}
}