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 l = sc.next();
        String[] sp = l.split("");
        int[] n = new int[4];
        for(int i=0; i<3; i++) {
            n[i] = Integer.parseInt(sp[i]);
        }
        String[] op = new String[3];
        int ans = n[0];
        for(int i=0; i<8; i++) {
            ans = n[0];
            for(int j=0; j<3; j++) {
                if((1 & i >> j) == 1) {
                    ans += n[j+1];
                    op[j] = "+";
                }else {
                    ans -= n[j+1];
                    op[j] = "-";
                }
            }
            if(ans == 7) {
                break;
            }
        }
        System.out.println(n[0]+op[0]+n[1]+op[1]+n[2]+op[2]+n[3]+"=7");
    }
}