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 sc = new Scanner(System.in);
        int line = sc.nextInt();
        sc.close();
        int d = line % 10;
        int c = (line / 10) % 10;
        int b = (line / 100) % 10;
        int a = (line / 1000) % 10;

        boolean endFlag = false;
        for(int i = 0; i <=1; i++){
            for(int j = 0; j <=1; j++){
                for(int k = 0; k <=1; k++){
                    int tmp = calc(a,b,i);
                    tmp = calc(tmp,c,j);
                    tmp = calc(tmp,d,k);
                    if(tmp == 7){
                        System.out.println(a + op(i) + b + op(j) + c + op(k) + d + "=7");
                        endFlag = true;
                        break;
                    }
                }
                if(endFlag){
                    break;
                }
            }
            if(endFlag){
                break;
            }
        }

    }

    private static String op(int i) {
        if(i == 0){
            return "+";
        }
        return "-";
    }

    private static int calc(int a, int b, int i) {
        if(i == 0){
            return a + b;
        }
        return a - b;
    }

}