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
$str = trim(fgets(STDIN));
for($i = 0; $i < 4; $i++){
    $num[$i] = $str[$i];
}
for($i = 0; $i < 2**3; $i++){
    $flagStr = sprintf("%03d", decbin($i));
    $result = $num[0];
    for($j = 0; $j < 3; $j++){
        if($flagStr[$j] == "0"){
            $result+=$num[$j+1];
        }else{
            $result-=$num[$j+1];
        }
    }
    if($result == 7){
        echo $num[0];
        for($i = 0; $i < 3; $i++){
            echo $flagStr[$i] == "0" ? "+" : "-";
            echo $num[$i+1];
        }
        echo "=7";
        exit;
    }
}