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 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner in = new Scanner(System.in)) {
            String S = in.next();
            int A = S.charAt(0) - '0';
            int B = S.charAt(1) - '0';
            int C = S.charAt(2) - '0';
            int D = S.charAt(3) - '0';

            for (int op1 = -1; op1 <= 1; op1 += 2) {
                for (int op2 = -1; op2 <= 1; op2 += 2) {
                    for (int op3 = -1; op3 <= 1; op3 += 2) {
                        if (A + op1 * B + op2 * C + op3 * D == 7) {
                            System.out.println("" + A + (op1 == 1 ? "+" : "-") + B + (op2 == 1 ? "+" : "-") + C + (op3 == 1 ? "+" : "-") + D + "=7");
                            return;
                        }
                    }
                }
            }

        }
    }
}