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.Collections.Generic;

namespace MyProgram{
    class AtCoder{
        static void Main(){
            string s = Console.ReadLine();
            int A = (int)s[0]-48;
            int B = (int)s[1]-48;
            int C = (int)s[2]-48;
            int D = (int)s[3]-48;
            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);
        }
    } 
}