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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)


import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
  		String  str = sc.next();
        String ans = "";
        int a = Character.getNumericValue(str.charAt(0));
        int b = Character.getNumericValue(str.charAt(1));
        int c = Character.getNumericValue(str.charAt(2));
        int d = Character.getNumericValue(str.charAt(3));
        
        if(a+b+c+d==7){
            ans = ""+a+"+"+b+"+"+c+"+"+d+"=7";
        }else if(a+b+c-d==7){
            ans = ""+a+"+"+b+"+"+c+"-"+d+"=7";
        }else if(a+b-c+d==7){
            ans = ""+a+"+"+b+"-"+c+"+"+d+"=7";
        }else if(a+b-c-d==7){
            ans = ""+a+"+"+b+"-"+c+"-"+d+"=7";
        }else if(a-b+c+d==7){
            ans = ""+a+"-"+b+"+"+c+"+"+d+"=7";
        }else if(a-b+c-d==7){
            ans = ""+a+"-"+b+"+"+c+"-"+d+"=7";
        }else if(a-b-c+d==7){
            ans = ""+a+"-"+b+"-"+c+"+"+d+"=7";
        }else if(a-b-c-d==7){
            ans = ""+a+"-"+b+"-"+c+"-"+d+"=7";
        }
        
        
		System.out.println(ans);
   }
}