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");
  inputStr = input[0].split(" ");
  const N = inputStr[0];
  //パラメータNを配列に持ち込む
  var ARR = [];
  for(var i=0 ; i<4 ; i++){
    ARR.push(Number.parseInt(N.substr(i,1)));
  }
  //bit値を0～3迄
  for(var i=0 ; i<8 ; i++){
    var str = "";
    //1桁目
    if( i&1 ){
      str = ARR[0] + "+" + ARR[1]
    } else {
      str = ARR[0] + "-" + ARR[1]
    }
    //2桁目
    if( i&1<<1 ){
      str += "+" + ARR[2]
    } else {
      str += "-" + ARR[2]
    }
    //3桁目
    if( i&1<<2 ){
      str += "+" + ARR[3]
    } else {
      str += "-" + ARR[3]
    }
    //結果判断
    if(eval(str) ===7){
      break;
    }
  }
  console.log(str+"=7");
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));