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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
int main() {
	int a, b, c, d;
	char p[2] = { '+','-' };
	scanf("%d", &a);
	d = a % 10; a /= 10;
	c = a % 10; a /= 10;
	b = a % 10; a /= 10;
	for (int i = 0; i < 2; i++)
	{
		for (int j = 0; j < 2; j++)
		{
			for (int k = 0; k < 2; k++)
			{
				if (a + b + c + d - 2 * ((i % 2)*b + (j % 2)*c + (k % 2)*d) == 7) {
					printf("%d%c%d%c%d%c%d=7", a, p[i], b, p[j], c, p[k], d);
					return 0;
				}
			}
		}
	}
	return 0;
}