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: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int main()
{
	string s;
	cin >> s;

	int N = s.size();
	int c[N];
	for (int i = 0; i <  N; i++) {
		c[i] = (int)(s.at(i) - '0' );
	}
	
	if (c[0] + c[1] + c[2] + c[3] == 7) cout << c[0] << '+' << c[1] << '+' << c[2] << '+' << c[3] << endl;
	else if (c[0] + c[1] + c[2] - c[3] == 7) cout << c[0] << '+' << c[1] << '+' << c[2] << '-' << c[3] << endl;
	else if (c[0] + c[1] - c[2] + c[3] == 7) cout << c[0] << '+' << c[1] << '-' << c[2] << '+' << c[3] << endl;
	else if (c[0] - c[1] + c[2] + c[3] == 7) cout << c[0] << '-' << c[1] << '+' << c[2] << '+' << c[3] << endl;
	else if (c[0] + c[1] - c[2] - c[3] == 7) cout << c[0] << '+' << c[1] << '-' << c[2] << '-' << c[3] << endl;
	else if (c[0] - c[1] - c[2] + c[3] == 7) cout << c[0] << '-' << c[1] << '-' << c[2] << '+' << c[3] << endl;
	else if (c[0] - c[1] + c[2] - c[3] == 7) cout << c[0] << '-' << c[1] << '+' << c[2] << '-' << c[3] << endl;
	else if (c[0] - c[1] - c[2] - c[3] == 7) cout << c[0] << '-' << c[1] << '-' << c[2] << '-' << c[3] << endl;

	return 0;
}