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 scanner = new Scanner(System.in);
		char[] array = scanner.next().toCharArray();

		int a = Character.getNumericValue(array[0]);
		int b = Character.getNumericValue(array[1]);
		int c = Character.getNumericValue(array[2]);
		int d = Character.getNumericValue(array[3]);

		String op1 = "+";
		String op2 = "+";
		String op3 = "+";

		int ans = a;

		for (int i = 0; i < 2; i++) {
			for (int j = 0; j < 2; j++) {
				for (int k = 0; k < 2; k++) {
					ans = a;
					if (i == 0) {
						ans += b;
					} else {
						ans -= b;
					}
					if (j == 0) {
						ans += c;
					} else {
						ans -= c;
					}
					if (k == 0) {
						ans += d;
					} else {
						ans -= d;
					}
					if(ans == 7){
						if(i == 1){
							op1 = "-";
						}
						if(j == 1){
							op2 = "-";
						}
						if(k == 1){
							op3 = "-";
						}
						System.out.println(a + op1 + b + op2 + c + op3 + d + "=7");
						return;
					}
				}
			}
		}
	}
}