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

fscanf(STDIN, "%d", $input);

$a = ($input / 1000) % 10;
$b = ($input / 100) % 10;
$c = ($input / 10) % 10;
$d = $input % 10;

if ($a + $b + $c + $d === 7) {
	$op = ['+', '+', '+'];
}

if ($a + $b + $c - $d === 7) {
	$op = ['+', '+', '-'];
}

if ($a + $b - $c - $d === 7) {
	$op = ['+', '-', '-'];
}

if ($a + $b - $c + $d === 7) {
	$op = ['+', '-', '+'];
}

if ($a - $b - $c - $d === 7) {
	$op = ['-', '-', '-'];
}

if ($a - $b - $c + $d === 7) {
	$op = ['-', '-', '+'];
}

if ($a - $b + $c - $d === 7) {
	$op = ['-', '+', '-'];
}

if ($a - $b + $c + $d === 7) {
	$op = ['-', '+', '+'];
}

printf("%d%s%d%s%d%s%d=7", $a, $op[0], $b, $op[1], $c, $op[2], $d);