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;

class ABC079C
{
	static public void Main(string[] args)
	{
		string ABCD = Console.ReadLine();
		int A = int.Parse(ABCD.Substring(0, 1));
		int B = int.Parse(ABCD.Substring(1, 1));
		int C = int.Parse(ABCD.Substring(2, 1));
		int D = int.Parse(ABCD.Substring(3, 1));

		for(int op1 = 0; op1<=1; op1++)
		{
			for(int op2=0; op2<=1; op2++)
			{
				for(int op3=0; op3<=1; op3++)
				{
					int s = A;
					if(op1 == 0)
						s += B;
					else
						s -= B;

					if(op2 == 0)
						s += C;
					else
						s -= C;

					if(op3 == 0)
						s += D;
					else
						s -= D;

					if(s == 7)
					{
						string pm1 = (op1 == 0) ? "+" : "-";
						string pm2 = (op2 == 0) ? "+" : "-";
						string pm3 = (op3 == 0) ? "+" : "-";
						Console.WriteLine("{0}{1}{2}{3}{4}{5}{6}=7", A, pm1, B, pm2, C, pm3, D);
						break;
					}
				}
			}
		}
	}
}