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
$n = trim(fgets(STDIN));
$numbers = str_split($n);

$ope = ["-", "+"];
for ($mask = 0; $mask < (1 << 3); $mask++) {
    
    $ans = $numbers[0];
    $ope = [];
    for ($i = 0; $i < 3; $i++) {
         
         if(($mask >> $i) & 1) {
             $ans += $numbers[$i+1];
              $ope[$i] = "+";
         } else {
             $ans -= $numbers[$i+1];
             $ope[$i] = "-";
         }
    }
    
    if($ans == 7) {
        echo $numbers[0].$ope[0].$numbers[1].$ope[1].$numbers[2].$ope[2].$numbers[3]."=7";
        break;
    }
     
}

?>