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++14 (GCC 5.4.1) (judge verdict: Accepted)

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
#include <stdlib.h>

int main() {

	char n[5];

	scanf("%s", &n);

	for (int i = 0; i < 4; i++) {
		n[i] -= '0';
	}

	for (int op = 0; op < 8; op++) {
		int a = n[0];
		for (int i = 0; i < 3; i++) {
			if ((op >> i) & 1) a += n[i + 1];
			else a -= n[i + 1];
		}
		if (a == 7) {
			printf("%d", n[0]);
			for (int i = 0; i < 3; i++) {
				if ((op >> i) & 1) printf("+");
				else printf("-");
				printf("%d", n[i + 1]);
			}
			printf("=7\n");
			return 0;
		}
	}

	return 0;
}