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.Linq;

namespace Library
{
}
namespace AtCoder
{
    using Library;
    class ABC079_C
    {
        static void Solve(int n, string Str, long sum, long[] input)
        {
            if (n == 3)
            {
                if (sum == 7)
                {
                    Console.WriteLine(Str + "=7");
                }
            }
            else
            {
                Solve(n + 1, Str + "+" + input[n + 1].ToString(), sum + input[n + 1], input);
                Solve(n + 1, Str + "-" + input[n + 1].ToString(), sum - input[n + 1], input);
            }
        }
        static void Main(string[] args)
        {
            long[] input = Console.ReadLine().Select(i => long.Parse(i.ToString())).ToArray();
            Solve(0, input[0].ToString(), input[0], input);
        }
    }
}