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: Accepted)

import java.util.Scanner;

public class Main {
    public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        int x = scan.nextInt();
        int d[] = new int[4];
        for(int i=0;i<4;i++){
            d[i] = x%10;
            x /= 10;
        }
        int a = d[3];//1のくらい
        int b = d[2];
        int c = d[1];
        int e = d[0];
        int k = 1;
        int j = 0;

        switch(k){
            case 1:j = a+b+c+e; if(j==7){System.out.println(a+  "+" + b + "+" + c + "+" + e + "=7" ); break;}
            case 2:j = a-b+c+e; if(j==7){System.out.println(a+  "-" + b + "+" + c + "+" + e + "=7" ); break;}
            case 3:j = a-b+c-e; if(j==7){System.out.println(a+  "-" + b + "+" + c + "-" + e + "=7" ); break;}
            case 4:j = a-b-c+e; if(j==7){System.out.println(a+  "-" + b + "-" + c + "+" + e + "=7" ); break;}
            case 5:j = a-b-c-e; if(j==7){System.out.println(a+  "-" + b + "-" + c + "-" + e + "=7" ); break;}
            case 6:j = a+b-c+e; if(j==7){System.out.println(a+  "+" + b + "-" + c + "+" + e + "=7" ); break;}
            case 7:j = a+b+c-e; if(j==7){System.out.println(a+  "+" + b + "+" + c + "-" + e + "=7" ); break;}
            case 8:j = a+b-c-e; if(j==7){System.out.println(a+  "+" + b + "-" + c + "-" + e + "=7" ); break;}
            default:System.out.println("間違い"); break;
        }
    }

}