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)

"use strict";

var main = function main(input) {
  var args = input.split('');
  var A = parseInt(args[0], 10);
  var B = parseInt(args[1], 10);
  var C = parseInt(args[2], 10);
  var D = parseInt(args[3], 10);

  if (A + B + C + D == 7) {
    console.log("".concat(A, "+").concat(B, "+").concat(C, "+").concat(D, "=7"));
  } else if (A - B + C + D == 7) {
    console.log("".concat(A, "-").concat(B, "+").concat(C, "+").concat(D, "=7"));
  } else if (A + B - C + D == 7) {
    console.log("".concat(A, "+").concat(B, "-").concat(C, "+").concat(D, "=7"));
  } else if (A + B + C - D == 7) {
    console.log("".concat(A, "+").concat(B, "+").concat(C, "-").concat(D, "=7"));
  } else if (A - B - C + D == 7) {
    console.log("".concat(A, "-").concat(B, "-").concat(C, "+").concat(D, "=7"));
  } else if (A - B + C - D == 7) {
    console.log("".concat(A, "-").concat(B, "+").concat(C, "-").concat(D, "=7"));
  } else if (A - B - C - D == 7) {
    console.log("".concat(A, "-").concat(B, "-").concat(C, "-").concat(D, "=7"));
  } else if (A + B - C - D == 7) {
    console.log("".concat(A, "+").concat(B, "-").concat(C, "-").concat(D, "=7"));
  }
};

main(require('fs').readFileSync('/dev/stdin', 'utf-8'));