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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
public class Main{
	public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String n[] = sc.nextLine().split("");
        int num[] = new int[4];

        for(int i=0; i<4; i++){
            num[i] = Integer.parseInt(n[i]);
        }

        for(int i=0; i<8; i++){
            int sum = num[0];
            String s = String.valueOf(num[0]);
            for(int j=0; j<3; j++){
                if((1&i>>j)==1){
                    sum += num[j+1];
                    s += "+" + num[j+1];
                }else{
                    sum -= num[j+1];
                    s += "-" + num[j+1];
                }
            }
            if(sum == 7){
                System.out.println(s + "=7");
            }
        }
    }
}