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 PHP (5.6.30) (judge verdict: Accepted)

<?php
	fscanf(STDIN,"%s", $str);

	$A = substr($str, 0, 1);
	$B = substr($str, 1, 1);
	$C = substr($str, 2, 1);
	$D = substr($str, 3, 1);


	$w1 = array($A + $B, $A - $B);

	$w2 = array($C + $D, $C - $D);

	for ($i = 0; $i < 2; $i++){

		for($j = 0; $j < 2; $j++){
			if ($w1[$i] + $w2[$j] === 7){
				if ($i === 0){
					if ($j === 0){
						echo "$A+$B+$C+$D=7\n";
						return;
					}else{
						echo "$A+$B+$C-$D=7\n";
						return;					}
				}else{
					if ($j === 0){
						echo "$A-$B+$C+$D=7\n";
						return;
					}else{
						echo "$A-$B+$C-$D=7\n";
						return;
					}
				}
			}elseif($w1[$i] - $w2[$j] === 7){
				if ($i === 0){
					if ($j === 0){
						echo "$A+$B-$C-$D=7\n";
						return;
					}else{
						echo "$A+$B-$C+$D=7\n";
						return;
					}
				}else{
					if ($j === 0){
						echo "$A-$B-$C-$D=7\n";
						return;
					}else{
						echo "$A-$B-$C+$D=7\n";
						return;
					}
				}
			}
		}


	}