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.Linq;
using System.Collections.Generic;
using System.IO;

namespace atcorder2
{
    class Program
    {
        public static long Read()
        {
            return long.Parse(Console.ReadLine());
        }

        public static long[] Reads()
        {

            return Console.ReadLine().Split().Select(long.Parse).ToArray();
        }

       
      



        static void Main(string[] args)
        {
            var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            Console.SetOut(sw);

            var x = Read();
            var a = x / 1000;
            x -= a * 1000;
            var b = x/100;
            x -= b * 100;
            var c = x / 10 ;
            x -= c * 10;
            var d = x;
            if (a+b+c+d==7) Console.WriteLine("{0}+{1}+{2}+{3}=7",a,b,c,d);
            else if (a+b+c-d==7) Console.WriteLine("{0}+{1}+{2}-{3}=7",a,b,c,d);
            else if (a+b-c+d==7) Console.WriteLine("{0}+{1}-{2}+{3}=7",a,b,c,d);
            else if (a-b+c+d==7) Console.WriteLine("{0}-{1}+{2}+{3}=7", a, b, c, d);
            else if (a+b-c-d==7) Console.WriteLine("{0}+{1}-{2}-{3}=7", a, b, c, d);
            else if (a-b+c-d==7) Console.WriteLine("{0}-{1}+{2}-{3}=7", a, b, c, d);
            else if (a-b-c+d==7) Console.WriteLine("{0}-{1}-{2}+{3}=7", a, b, c, d);
            else if (a-b-c-d==7) Console.WriteLine("{0}-{1}-{2}-{3}=7", a, b, c, d);

            Console.Out.Flush();
        }
    }
}