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;

namespace ABC079_C_Train_Ticket
{
	internal class Program
	{
		public static void Main(string[] args)
		{
			string input = Console.ReadLine();
			int a = int.Parse(input.Substring(0, 1));
			int b = int.Parse(input.Substring(1, 1));
			int c = int.Parse(input.Substring(2, 1));
			int d = int.Parse(input.Substring(3, 1));

			if (b + c + d == 7 - a)
			{
				Console.WriteLine(a + "+" + b + "+" + c + "+" + d + "=" + 7);
			}else if (- b + c + d == 7 - a)
			{
				Console.WriteLine(a + "-" + b + "+" + c + "+" + d + "=" + 7);
			}else if (- b - c + d == 7 - a)
			{
				Console.WriteLine(a + "-" + b + "-" + c + "+" + d + "=" + 7);
			}else if (- b - c - d == 7 - a)
			{
				Console.WriteLine(a + "-" + b + "-" + c + "-" + d + "=" + 7);
			}else if (- b + c - d == 7 - a)
			{
				Console.WriteLine(a + "-" + b + "+" + c + "-" + d + "=" + 7);
			}else if (b - c + d == 7 - a)
			{
				Console.WriteLine(a + "+" + b + "-" + c + "+" + d + "=" + 7);
			}else if (b - c - d == 7 - a)
			{
				Console.WriteLine(a + "+" + b + "-" + c + "-" + d + "=" + 7);
			}else if (b + c - d == 7 - a)
			{
				Console.WriteLine(a + "+" + b + "+" + c + "-1" + d + "=" + 7);
			}
		}
	}
}