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);
		String numbers = sc.next();
		int A = Integer.valueOf(numbers.substring(0,1));
		int B = Integer.valueOf(numbers.substring(1,2));
		int C = Integer.valueOf(numbers.substring(2,3));
		int D = Integer.valueOf(numbers.substring(3,4));
		sc.close();
		int[] ticket = {B,C,D};
		String[] op = {"000",
		"001",
		"010",
		"011",
		"100",
		"101",
		"110",
		"111"
		};
		for(int i = 0; i < op.length; i++){
          	int ans = A;
			for(int j = 0; j < ticket.length; j++){
				if(op[i].charAt(j) == "0".charAt(0)) { ans -= ticket[j]; }
				if(op[i].charAt(j) == "1".charAt(0)){ ans += ticket[j]; }
				if(j == 2 && ans == 7){
					String out = String.valueOf(A) + printOp(op[i].substring(0, 1)) + String.valueOf(B)
			+ printOp(op[i].substring(1, 2)) + String.valueOf(C) + printOp(op[i].substring(2, 3)) + String.valueOf(D) + "=7";
					System.out.println(out);
					return;
				}
			}
			// System.out.println(ans);
		}
	}

	static String printOp(String op){
		if(op.equals("0")) return "-";
		return "+";
	}

}