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 s = sc.next();
		int a = Integer.parseInt(s.substring(0, 1));
		int b = Integer.parseInt(s.substring(1, 2));
		int c = Integer.parseInt(s.substring(2, 3));
		int d = Integer.parseInt(s.substring(3, 4));

		for(int i = 0 ; i < 1 << 3 ; i++) {
			StringBuilder sb = new StringBuilder();
			sb.append(a);
			int result = a;
			if((1 & i) == 1) {
				sb.append("+");
				result += b;
			} else {
				sb.append("-");
				result -= b;
			}
			sb.append(b);
			if((1 & i >> 1) == 1) {
				sb.append("+");
				result += c;
			} else {
				sb.append("-");
				result -= c;
			}
			sb.append(c);
			if((1 & i >> 2) == 1) {
				sb.append("+");
				result += d;
			} else {
				sb.append("-");
				result -= d;
			}
			sb.append(d);
			if(result == 7) {
				sb.append("=7");
				System.out.println(sb.toString());
				sc.close();
				return;
			}
		}
//		System.out.println();

		sc.close();

	}

}