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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php
  $input = trim(fgets(STDIN));

  for($i=0; $i<8; $i++){
      $k = 1;
      $ans = $input[0];
      $op = [];
      for($j=0; $j<3; $j++){
          if($i>>$j & 1){
              $ans += $input[$k];
              $k++;
              $op[] = "+";
          }else{
              $ans -= $input[$k];
              $k++;
              $op[] = "-";
          }
      }
    //   echo $ans."\n";
      $op[] = "=7";
      if($ans == 7){
          for($l=0; $l<4; $l++){
              echo $input[$l].$op[$l];
          }
          exit;
      }
  }