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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function Main(input){
	input = input.split("\n")[0].split("").map(a=>~~a);
  var A = input[0];
  var B = input[1];
  var C = input[2];
  var D = input[3];
 	var hoge = {"1":"+","-1":"-"};
  var seven = "=7"
  for(var i = -1; i < 2; i+=2){
  for(var j = -1; j < 2; j+=2){
  for(var k = -1; k < 2; k+=2){
  	if(A+i*B+j*C+k*D==7){
    	return [A,hoge[i],B,hoge[j],C,hoge[k],D,seven].join("")
    }
  }
  }
  }
  
}

console.log(Main(require("fs").readFileSync("/dev/stdin", "utf8")));