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 s = sc.next();
      int[] x = new int[4];
      for(int i=0;i<4;i++){
        x[i] = Character.getNumericValue(s.charAt(i));
      }     
      for(int i=0;i<Math.pow(2,3);i++){
        char[] op = new char[3];
        for(int j=0;j<3;j++){
          if((i>>j&1)==1){
            op[j]='+';
          }else{
            op[j]='-';
          }
        }
        int sum = x[0];
        for(int k=0;k<3;k++){
          if(op[k]=='+'){
            sum+=x[k+1];
          }else{
            sum-=x[k+1];
          }
        }
        if(sum==7){
          for(int l=0;l<3;l++){
            System.out.print(x[l]);
            System.out.print(op[l]);
          }
          System.out.println(x[3]+"=7");
          break;
        }
      }
      
    }
}