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: Runtime Error)

import java.util.Scanner;

public class Main {
    public Scanner in=new Scanner(System.in);
    public int[] inputNum=new int[4];
    public String outputNum;
    public String[] cc={"+","-"};

    public static void main(String args[]){
        Main m=new Main();

        for(int i=0;i<4;i++){
            m.inputNum[i]=m.in.nextInt();
        }

        if(m.inputNum[0]+m.inputNum[1]+m.inputNum[2]+m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"+"+m.inputNum[1]+"+"+m.inputNum[2]+"+"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]+m.inputNum[1]+m.inputNum[2]-m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"+"+m.inputNum[1]+"+"+m.inputNum[2]+"-"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]+m.inputNum[1]-m.inputNum[2]+m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"+"+m.inputNum[1]+"-"+m.inputNum[2]+"+"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]+m.inputNum[1]-m.inputNum[2]-m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"+"+m.inputNum[1]+"-"+m.inputNum[2]+"-"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]-m.inputNum[1]+m.inputNum[2]+m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"-"+m.inputNum[1]+"+"+m.inputNum[2]+"+"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]-m.inputNum[1]+m.inputNum[2]-m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"-"+m.inputNum[1]+"+"+m.inputNum[2]+"-"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]-m.inputNum[1]-m.inputNum[2]+m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"-"+m.inputNum[1]+"-"+m.inputNum[2]+"+"+m.inputNum[3]+"=7");
        }
        if(m.inputNum[0]-m.inputNum[1]-m.inputNum[2]-m.inputNum[3]==7){
            System.out.println(m.inputNum[0]+"-"+m.inputNum[1]+"-"+m.inputNum[2]+"-"+m.inputNum[3]+"=7");
        }
    }
}