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: Wrong Answer)

import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    String s;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.s = sc.next();
    }
    
    //解答処理
    private String solve() {
        String answer = null;
        String[] S = s.split("");
        int A = Integer.valueOf(S[0]);
        int B = Integer.valueOf(S[1]);
        int C = Integer.valueOf(S[2]);
        int D = Integer.valueOf(S[3]);
        
        if (A + B + C + D == 7) {
        	answer = A + "+" + B + "+" + C + "+" + D + "==7";
        } else if (A + B + C - D == 7) {
        	answer = A + "+" + B + "+" + C + "-" + D + "==7";
        } else if (A + B - C + D == 7) {
        	answer = A + "+" + B + "-" + C + "+" + D + "==7";
        } else if (A - B + C + D == 7) {
        	answer = A + "-" + B + "+" + C + "+" + D + "==7";
        } else if (A - B - C + D == 7) {
        	answer = A + "-" + B + "-" + C + "+" + D + "==7";
        } else if (A + B - C - D == 7) {
        	answer = A + "+" + B + "-" + C + "-" + D + "==7";
        } else if (A - B + C - D == 7) {
        	answer = A + "-" + B + "+" + C + "-" + D + "==7";
        } else if (A - B - C - D == 7) {
        	answer = A + "-" + B + "-" + C + "-" + D + "==7";
        }
        
        return answer;
    }
    
    //出力
    public void show(String answer) {
        System.out.println(answer);
    }

}