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.Text;
using System.Collections.Generic;
using System.Linq;
using E = System.Linq.Enumerable;
 
class Program
 {
  static string[] map;
  static int H;
  static int W;
        static void Main(string[] args)
        {
          //入力を受け取る
          var ABCD = int.Parse(Console.ReadLine());
          var A = ABCD/1000;
          var B = (ABCD%1000)/100;
          var C = (ABCD%100)/10;
          var D = (ABCD%10);
          var sum = A;
          var flag = false;
          string str = A.ToString();
          for(int i = 0;i < 2 ; i++){
            sum = A;
            str = A.ToString();
            for(int j = 0;j < 2 ; j++){
              for(int k = 0;k < 2 ; k++){
                //Console.WriteLine(i+" "+j+" "+k);
                if(i == 0){
                  sum += B;
                  str = str+'+'+B;
                  if(j == 0){
                    sum += C;
                    str = str+'+'+C;
                    if(k == 0){
                      sum += D;
                      str = str+'+'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }else{
                      sum -= D;
                      str = str+'-'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }
                  }else{
                    sum -= C;
                    str = str+'-'+C;
                    if(k == 0){
                      sum += D;
                      str = str+'+'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }else{
                      sum -= D;
                      str = str+'-'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }
                  }
                }else{
                  sum -= B;
                  str = str+'-'+B;
                  if(j == 0){
                    sum += C;
                    str = str+'+'+C;
                    if(k == 0){
                      sum += D;
                      str = str+'+'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }else{
                      sum -= D;
                      str = str+'-'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }
                  }else{
                    sum -= C;
                    str = str+'-'+C;
                    if(k == 0){
                      sum += D;
                      str = str+'+'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }else{
                      sum -= D;
                      str = str+'-'+D;
                      if(sum == 7){
                        flag = true;
                        break;
                      }
                    }
                  }
                }
              }
              if(flag){
                break;
              }
            }
            if(flag){
              break;
            }
          }
          if(flag){
            str = str+"=7";
            Console.WriteLine(str);
          }
          
        }
}