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;

class Main {
	static void f(int A, int B, int C, int D) {
		for(int i = 0; i < 2; i++) {
			for(int j = 0; j < 2; j++) {
				for(int k = 0; k < 2; k++) {
					int ans = A;
					ans += (i == 0) ? B : (-B);
					ans += (j == 0) ? C : (-C);
					ans += (k == 0) ? D : (-D);
					if(ans == 7) {
						char op1 = (i == 0) ? '+' : '-';
						char op2 = (j == 0) ? '+' : '-';
						char op3 = (k == 0) ? '+' : '-';
						System.out.println(A+""+op1+""+B+""+op2+""+C+""+op3+""+D+"=7");
						return;
					}
				}
			}
		}
	}
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int A = s/1000; s -= A*1000;
		int B = s/100; s -= B*100;
		int C = s/10, D = s%10;
		f(A,B,C,D);
	}
}