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 input = scan.nextInt();
        int A, B, C, D, a, b, c, d, e, f, g,h;

        D = input % 10;
        input /= 10;
        C = input % 10;
        input /= 10;
        B = input % 10;
        input /= 10;
        A = input % 10;
        input /= 10;

        a = A + B + C + D;
        b = A - B + C + D;
        c = A + B - C + D;
        d = A + B + C - D;
        e = A - B - C + D;
        f = A + B - C - D;
        g = A - B + C - D;
        h = A - B - C - D;

        if (a == 7) {
            System.out.println(A + "+" + B + "+" + C + "+" + D +"=7");
        } else if (b == 7) {
            System.out.println(A + "-" + B + "+" + C + "+" + D +"=7");
        } else if (c == 7) {
            System.out.println(A + "+" + B + "-" + C + "+" + D+"=7");
        } else if (d == 7) {
            System.out.println(A + "+" + B + "+" + C + "-" + D+"=7");
        } else if (e == 7) {
            System.out.println(A + "-" + B + "-" + C + "+" + D+"=7");
        } else if (f == 7) {
            System.out.println(A + "+" + B + "-" + C + "-" + D+"=7");
        } else if (g == 7) {
            System.out.println(A + "-" + B + "+" + C + "-" + D+"=7");
        }else if (h == 7) {
            System.out.println(A + "-" + B + "-" + C + "-" + D+"=7");
        }
    }
}